Add the pdf plugin's source in src\pdf.

pdf/instance.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "pdf/instance.h"
+
+#include <algorithm>  // for min()
+#define _USE_MATH_DEFINES  // for M_PI
+#include <cmath>      // for log() and pow()
+#include <math.h>
+#include <list>
+
+#include "base/json/json_reader.h"
+#include "base/json/json_writer.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/values.h"
+#include "chrome/browser/chrome_page_zoom_constants.h"
+#include "chrome/common/content_restriction.h"
+#include "content/public/common/page_zoom.h"
+#include "net/base/escape.h"
+#include "pdf/draw_utils.h"
+#include "pdf/number_image_generator.h"
+#include "pdf/pdf.h"
+#include "pdf/resource_consts.h"
+#include "ppapi/c/dev/ppb_cursor_control_dev.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/pp_rect.h"
+#include "ppapi/c/private/ppp_pdf.h"
+#include "ppapi/c/trusted/ppb_url_loader_trusted.h"
+#include "ppapi/cpp/core.h"
+#include "ppapi/cpp/dev/font_dev.h"
+#include "ppapi/cpp/dev/memory_dev.h"
+#include "ppapi/cpp/dev/text_input_dev.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/point.h"
+#include "ppapi/cpp/private/pdf.h"
+#include "ppapi/cpp/rect.h"
+#include "ppapi/cpp/resource.h"
+#include "ppapi/cpp/url_request_info.h"
+#include "ui/events/keycodes/keyboard_codes.h"
+
+#if defined(OS_MACOSX)
+#include "base/mac/mac_util.h"
+#endif
+
+namespace chrome_pdf {
+
+struct ToolbarButtonInfo {
+  uint32 id;
+  Button::ButtonStyle style;
+  PP_ResourceImage normal;
+  PP_ResourceImage highlighted;
+  PP_ResourceImage pressed;
+};
+
+namespace {
+
+// Uncomment following #define to enable thumbnails.
+// #define ENABLE_THUMBNAILS
+
+const uint32 kToolbarSplashTimeoutMs = 6000;
+const uint32 kMessageTextColor = 0xFF575757;
+const uint32 kMessageTextSize = 22;
+const uint32 kProgressFadeTimeoutMs = 250;
+const uint32 kProgressDelayTimeoutMs = 1000;
+const uint32 kAutoScrollTimeoutMs = 50;
+const double kAutoScrollFactor = 0.2;
+
+// Javascript methods.
+const char* kJSAccessibility = "accessibility";
+const char* kJSDocumentLoadComplete = "documentLoadComplete";
+const char* kJSGetHeight = "getHeight";
+const char* kJSGetHorizontalScrollbarThickness =
+    "getHorizontalScrollbarThickness";
+const char* kJSGetPageLocationNormalized = "getPageLocationNormalized";
+const char* kJSGetVerticalScrollbarThickness = "getVerticalScrollbarThickness";
+const char* kJSGetWidth = "getWidth";
+const char* kJSGetZoomLevel = "getZoomLevel";
+const char* kJSGoToPage = "goToPage";
+const char* kJSGrayscale = "grayscale";
+const char* kJSLoadPreviewPage = "loadPreviewPage";
+const char* kJSOnLoad = "onload";
+const char* kJSOnPluginSizeChanged = "onPluginSizeChanged";
+const char* kJSOnScroll = "onScroll";
+const char* kJSPageXOffset = "pageXOffset";
+const char* kJSPageYOffset = "pageYOffset";
+const char* kJSPrintPreviewPageCount = "printPreviewPageCount";
+const char* kJSReload = "reload";
+const char* kJSRemovePrintButton = "removePrintButton";
+const char* kJSResetPrintPreviewUrl = "resetPrintPreviewUrl";
+const char* kJSSendKeyEvent = "sendKeyEvent";
+const char* kJSSetPageNumbers = "setPageNumbers";
+const char* kJSSetPageXOffset = "setPageXOffset";
+const char* kJSSetPageYOffset = "setPageYOffset";
+const char* kJSSetZoomLevel = "setZoomLevel";
+const char* kJSZoomFitToHeight = "fitToHeight";
+const char* kJSZoomFitToWidth = "fitToWidth";
+const char* kJSZoomIn = "zoomIn";
+const char* kJSZoomOut = "zoomOut";
+
+// URL reference parameters.
+// For more possible parameters, see RFC 3778 and the "PDF Open Parameters"
+// document from Adobe.
+const char kDelimiters[] = "#&";
+const char kNamedDest[] = "nameddest";
+const char kPage[] = "page";
+
+const char kChromePrint[] = "chrome://print/";
+
+// Dictionary Value key names for the document accessibility info
+const char kAccessibleNumberOfPages[] = "numberOfPages";
+const char kAccessibleLoaded[] = "loaded";
+const char kAccessibleCopyable[] = "copyable";
+
+const ToolbarButtonInfo kPDFToolbarButtons[] = {
+  { kFitToPageButtonId, Button::BUTTON_STATE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP_PRESSED },
+  { kFitToWidthButtonId, Button::BUTTON_STATE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW_PRESSED },
+  { kZoomOutButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT_PRESSED },
+  { kZoomInButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN_PRESSED },
+  { kSaveButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_SAVE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_SAVE_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_SAVE_PRESSED },
+  { kPrintButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_PRINT,
+      PP_RESOURCEIMAGE_PDF_BUTTON_PRINT_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_PRINT_PRESSED },
+};
+
+const ToolbarButtonInfo kPDFNoPrintToolbarButtons[] = {
+  { kFitToPageButtonId, Button::BUTTON_STATE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP_PRESSED },
+  { kFitToWidthButtonId, Button::BUTTON_STATE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW_PRESSED },
+  { kZoomOutButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT_PRESSED },
+  { kZoomInButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN_PRESSED },
+  { kSaveButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_SAVE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_SAVE_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_SAVE_PRESSED },
+  { kPrintButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_PRINT_DISABLED,
+      PP_RESOURCEIMAGE_PDF_BUTTON_PRINT_DISABLED,
+      PP_RESOURCEIMAGE_PDF_BUTTON_PRINT_DISABLED }
+};
+
+const ToolbarButtonInfo kPrintPreviewToolbarButtons[] = {
+  { kFitToPageButtonId, Button::BUTTON_STATE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTP_PRESSED },
+  { kFitToWidthButtonId, Button::BUTTON_STATE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_FTW_PRESSED },
+  { kZoomOutButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMOUT_PRESSED },
+  { kZoomInButtonId, Button::BUTTON_CLICKABLE,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN_END,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN_END_HOVER,
+      PP_RESOURCEIMAGE_PDF_BUTTON_ZOOMIN_END_PRESSED },
+};
+
+static const char kPPPPdfInterface[] = PPP_PDF_INTERFACE_1;
+
+PP_Var GetLinkAtPosition(PP_Instance instance, PP_Point point) {
+  pp::Var var;
+  void* object =
+      pp::Instance::GetPerInstanceObject(instance, kPPPPdfInterface);
+  if (object)
+    var = static_cast<Instance*>(object)->GetLinkAtPosition(pp::Point(point));
+  return var.Detach();
+}
+
+void Transform(PP_Instance instance, PP_PrivatePageTransformType type) {
+  void* object =
+      pp::Instance::GetPerInstanceObject(instance, kPPPPdfInterface);
+  if (object) {
+    Instance* obj_instance = static_cast<Instance*>(object);
+    switch (type) {
+      case PP_PRIVATEPAGETRANSFORMTYPE_ROTATE_90_CW:
+        obj_instance->RotateClockwise();
+        break;
+      case PP_PRIVATEPAGETRANSFORMTYPE_ROTATE_90_CCW:
+        obj_instance->RotateCounterclockwise();
+        break;
+    }
+  }
+}
+
+const PPP_Pdf ppp_private = {
+  &GetLinkAtPosition,
+  &Transform
+};
+
+int ExtractPrintPreviewPageIndex(const std::string& src_url) {
+  // Sample |src_url| format: chrome://print/id/page_index/print.pdf
+  std::vector<std::string> url_substr;
+  base::SplitString(src_url.substr(strlen(kChromePrint)), '/', &url_substr);
+  if (url_substr.size() != 3)
+    return -1;
+
+  if (url_substr[2] != "print.pdf")
+    return -1;
+
+  int page_index = 0;
+  if (!base::StringToInt(url_substr[1], &page_index))
+    return -1;
+  return page_index;
+}
+
+bool IsPrintPreviewUrl(const std::string& url) {
+  return url.substr(0, strlen(kChromePrint)) == kChromePrint;
+}
+
+void ScalePoint(float scale, pp::Point* point) {
+  point->set_x(static_cast<int>(point->x() * scale));
+  point->set_y(static_cast<int>(point->y() * scale));
+}
+
+void ScaleRect(float scale, pp::Rect* rect) {
+  int left = static_cast<int>(floorf(rect->x() * scale));
+  int top = static_cast<int>(floorf(rect->y() * scale));
+  int right = static_cast<int>(ceilf((rect->x() + rect->width()) * scale));
+  int bottom = static_cast<int>(ceilf((rect->y() + rect->height()) * scale));
+  rect->SetRect(left, top, right - left, bottom - top);
+}
+
+template<class T>
+T ClipToRange(T value, T lower_boundary, T upper_boundary) {
+  DCHECK(lower_boundary <= upper_boundary);
+  return std::max<T>(lower_boundary, std::min<T>(value, upper_boundary));
+}
+
+}  // namespace
+
+Instance::Instance(PP_Instance instance)
+    : pp::InstancePrivate(instance),
+      pp::Find_Private(this),
+      pp::Printing_Dev(this),
+      pp::Selection_Dev(this),
+      pp::WidgetClient_Dev(this),
+      pp::Zoom_Dev(this),
+      cursor_(PP_CURSORTYPE_POINTER),
+      timer_pending_(false),
+      current_timer_id_(0),
+      zoom_(1.0),
+      device_scale_(1.0),
+      printing_enabled_(true),
+      hidpi_enabled_(false),
+      full_(IsFullFrame()),
+      zoom_mode_(full_ ? ZOOM_AUTO : ZOOM_SCALE),
+      did_call_start_loading_(false),
+      is_autoscroll_(false),
+      scrollbar_thickness_(-1),
+      scrollbar_reserved_thickness_(-1),
+      current_tb_info_(NULL),
+      current_tb_info_size_(0),
+      paint_manager_(this, this, true),
+      delayed_progress_timer_id_(0),
+      first_paint_(true),
+      painted_first_page_(false),
+      show_page_indicator_(false),
+      document_load_state_(LOAD_STATE_LOADING),
+      preview_document_load_state_(LOAD_STATE_COMPLETE),
+      told_browser_about_unsupported_feature_(false),
+      print_preview_page_count_(0) {
+  loader_factory_.Initialize(this);
+  timer_factory_.Initialize(this);
+  form_factory_.Initialize(this);
+  print_callback_factory_.Initialize(this);
+  engine_.reset(PDFEngine::Create(this));
+  pp::Module::Get()->AddPluginInterface(kPPPPdfInterface, &ppp_private);
+  AddPerInstanceObject(kPPPPdfInterface, this);
+
+  RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_MOUSE);
+  RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_WHEEL);
+  RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_KEYBOARD);
+  RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_TOUCH);
+}
+
+Instance::~Instance() {
+  RemovePerInstanceObject(kPPPPdfInterface, this);
+}
+
+bool Instance::Init(uint32_t argc, const char* argn[], const char* argv[]) {
+  // For now, we hide HiDPI support behind a flag.
+  if (pp::PDF::IsFeatureEnabled(this, PP_PDFFEATURE_HIDPI))
+    hidpi_enabled_ = true;
+
+  printing_enabled_ = pp::PDF::IsFeatureEnabled(this, PP_PDFFEATURE_PRINTING);
+  if (printing_enabled_) {
+    CreateToolbar(kPDFToolbarButtons, arraysize(kPDFToolbarButtons));
+  } else {
+    CreateToolbar(kPDFNoPrintToolbarButtons,
+                  arraysize(kPDFNoPrintToolbarButtons));
+  }
+
+  CreateProgressBar();
+
+  // Load autoscroll anchor image.
+  autoscroll_anchor_ =
+      CreateResourceImage(PP_RESOURCEIMAGE_PDF_PAN_SCROLL_ICON);
+
+#ifdef ENABLE_THUMBNAILS
+  CreateThumbnails();
+#endif
+  const char* url = NULL;
+  for (uint32_t i = 0; i < argc; ++i) {
+    if (strcmp(argn[i], "src") == 0) {
+      url = argv[i];
+      break;
+    }
+  }
+
+  if (!url)
+    return false;
+
+  CreatePageIndicator(IsPrintPreviewUrl(url));
+
+  if (!full_) {
+    // For PDFs embedded in a frame, we don't get the data automatically like we
+    // do for full-frame loads.  Start loading the data manually.
+    LoadUrl(url);
+  }
+
+  ZoomLimitsChanged(kMinZoom, kMaxZoom);
+
+  text_input_.reset(new pp::TextInput_Dev(this));
+
+  url_ = url;
+  return engine_->New(url);
+}
+
+bool Instance::HandleDocumentLoad(const pp::URLLoader& loader) {
+  delayed_progress_timer_id_ = ScheduleTimer(kProgressBarId,
+                                             kProgressDelayTimeoutMs);
+  return engine_->HandleDocumentLoad(loader);
+}
+
+bool Instance::HandleInputEvent(const pp::InputEvent& event) {
+  // To simplify things, convert the event into device coordinates if it is
+  // a mouse event.
+  pp::InputEvent event_device_res(event);
+  {
+    pp::MouseInputEvent mouse_event(event);
+    if (!mouse_event.is_null()) {
+      pp::Point point = mouse_event.GetPosition();
+      pp::Point movement = mouse_event.GetMovement();
+      ScalePoint(device_scale_, &point);
+      ScalePoint(device_scale_, &movement);
+      mouse_event = pp::MouseInputEvent(
+          this,
+          event.GetType(),
+          event.GetTimeStamp(),
+          event.GetModifiers(),
+          mouse_event.GetButton(),
+          point,
+          mouse_event.GetClickCount(),
+          movement);
+      event_device_res = mouse_event;
+    }
+  }
+
+  // Check if we need to go to autoscroll mode.
+  if (event.GetType() == PP_INPUTEVENT_TYPE_MOUSEMOVE &&
+     (event.GetModifiers() & PP_INPUTEVENT_MODIFIER_MIDDLEBUTTONDOWN)) {
+    pp::MouseInputEvent mouse_event(event_device_res);
+    pp::Point pos = mouse_event.GetPosition();
+    EnableAutoscroll(pos);
+    UpdateCursor(CalculateAutoscroll(pos));
+    return true;
+  } else {
+    // Quit autoscrolling on any other event.
+    DisableAutoscroll();
+  }
+
+#ifdef ENABLE_THUMBNAILS
+  if (event.GetType() == PP_INPUTEVENT_TYPE_MOUSELEAVE)
+    thumbnails_.SlideOut();
+
+  if (thumbnails_.HandleEvent(event_device_res))
+    return true;
+#endif
+
+  if (toolbar_->HandleEvent(event_device_res))
+    return true;
+
+#ifdef ENABLE_THUMBNAILS
+  if (v_scrollbar_.get() && event.GetType() == PP_INPUTEVENT_TYPE_MOUSEMOVE) {
+    pp::MouseInputEvent mouse_event(event);
+    pp::Point pt = mouse_event.GetPosition();
+    pp::Rect v_scrollbar_rc;
+    v_scrollbar_->GetLocation(&v_scrollbar_rc);
+    // There is a bug (https://bugs.webkit.org/show_bug.cgi?id=45208)
+    // in the webkit that makes event.u.mouse.button
+    // equal to PP_INPUTEVENT_MOUSEBUTTON_LEFT, even when no button is pressed.
+    // To work around this issue we use modifier for now, and will switch
+    // to button once the bug is fixed and webkit got merged back to our tree.
+    if (v_scrollbar_rc.Contains(pt) &&
+        (event.GetModifiers() & PP_INPUTEVENT_MODIFIER_LEFTBUTTONDOWN)) {
+      thumbnails_.SlideIn();
+    }
+
+    // When scrollbar is in the scrolling mode we should display thumbnails
+    // even the mouse is outside the thumbnail and scrollbar areas.
+    // If mouse is outside plugin area, we are still getting mouse move events
+    // while scrolling. See bug description for details:
+    // http://code.google.com/p/chromium/issues/detail?id=56444
+    if (!v_scrollbar_rc.Contains(pt) && thumbnails_.visible() &&
+        !(event.GetModifiers() & PP_INPUTEVENT_MODIFIER_LEFTBUTTONDOWN) &&
+        !thumbnails_.rect().Contains(pt)) {
+      thumbnails_.SlideOut();
+    }
+  }
+#endif
+
+  // Need to pass the event to the engine first, since if we're over an edit
+  // control we want it to get keyboard events (like space) instead of the
+  // scrollbar.
+  // TODO: will have to offset the mouse coordinates once we support bidi and
+  // there could be scrollbars on the left.
+  pp::InputEvent offset_event(event_device_res);
+  bool try_engine_first = true;
+  switch (offset_event.GetType()) {
+    case PP_INPUTEVENT_TYPE_MOUSEDOWN:
+    case PP_INPUTEVENT_TYPE_MOUSEUP:
+    case PP_INPUTEVENT_TYPE_MOUSEMOVE:
+    case PP_INPUTEVENT_TYPE_MOUSEENTER:
+    case PP_INPUTEVENT_TYPE_MOUSELEAVE: {
+      pp::MouseInputEvent mouse_event(event_device_res);
+      pp::MouseInputEvent mouse_event_dip(event);
+      pp::Point point = mouse_event.GetPosition();
+      point.set_x(point.x() - available_area_.x());
+      offset_event = pp::MouseInputEvent(
+          this,
+          event.GetType(),
+          event.GetTimeStamp(),
+          event.GetModifiers(),
+          mouse_event.GetButton(),
+          point,
+          mouse_event.GetClickCount(),
+          mouse_event.GetMovement());
+      if (!engine_->IsSelecting()) {
+        if (!IsOverlayScrollbar() &&
+            !available_area_.Contains(mouse_event.GetPosition())) {
+          try_engine_first = false;
+        } else if (IsOverlayScrollbar()) {
+          pp::Rect temp;
+          if ((v_scrollbar_.get() && v_scrollbar_->GetLocation(&temp) &&
+              temp.Contains(mouse_event_dip.GetPosition())) ||
+              (h_scrollbar_.get() && h_scrollbar_->GetLocation(&temp) &&
+              temp.Contains(mouse_event_dip.GetPosition()))) {
+            try_engine_first = false;
+          }
+        }
+      }
+      break;
+    }
+    default:
+      break;
+  }
+  if (try_engine_first && engine_->HandleEvent(offset_event))
+    return true;
+
+  // Left/Right arrows should scroll to the beginning of the Prev/Next page if
+  // there is no horizontal scroll bar.
+  // If fit-to-height, PgDown/PgUp should scroll to the beginning of the
+  // Prev/Next page.
+  if (v_scrollbar_.get() && event.GetType() == PP_INPUTEVENT_TYPE_KEYDOWN) {
+    pp::KeyboardInputEvent keyboard_event(event);
+    bool page_down =
+        (!h_scrollbar_.get() &&
+            keyboard_event.GetKeyCode() == ui::VKEY_RIGHT) ||
+        (zoom_mode_ == ZOOM_FIT_TO_PAGE &&
+            keyboard_event.GetKeyCode() == ui::VKEY_NEXT);
+    bool page_up =
+        (!h_scrollbar_.get() &&
+            keyboard_event.GetKeyCode() == ui::VKEY_LEFT) ||
+        (zoom_mode_ == ZOOM_FIT_TO_PAGE &&
+            keyboard_event.GetKeyCode() == ui::VKEY_PRIOR);
+
+    if (page_down) {
+      int page = engine_->GetFirstVisiblePage();
+      // Engine calculates visible page including delimiter to the page size.
+      // We need to check here if the page itself is completely out of view and
+      // scroll to the next one in that case.
+      if (engine_->GetPageRect(page).bottom() * zoom_ <=
+          v_scrollbar_->GetValue())
+        page++;
+      ScrollToPage(page + 1);
+      UpdateCursor(PP_CURSORTYPE_POINTER);
+      return true;
+    } else if (page_up) {
+      int page = engine_->GetFirstVisiblePage();
+      if (engine_->GetPageRect(page).y() * zoom_ >= v_scrollbar_->GetValue())
+        page--;
+      ScrollToPage(page);
+      UpdateCursor(PP_CURSORTYPE_POINTER);
+      return true;
+    }
+  }
+
+  if (v_scrollbar_.get() && v_scrollbar_->HandleEvent(event)) {
+    UpdateCursor(PP_CURSORTYPE_POINTER);
+    return true;
+  }
+
+  if (h_scrollbar_.get() && h_scrollbar_->HandleEvent(event)) {
+    UpdateCursor(PP_CURSORTYPE_POINTER);
+    return true;
+  }
+
+  if (timer_pending_ &&
+      (event.GetType() == PP_INPUTEVENT_TYPE_MOUSEUP ||
+       event.GetType() == PP_INPUTEVENT_TYPE_MOUSEMOVE)) {
+    timer_factory_.CancelAll();
+    timer_pending_ = false;
+  } else if (event.GetType() == PP_INPUTEVENT_TYPE_MOUSEMOVE &&
+             engine_->IsSelecting()) {
+    bool set_timer = false;
+    pp::MouseInputEvent mouse_event(event);
+    if (v_scrollbar_.get() &&
+        (mouse_event.GetPosition().y() <= 0 ||
+         mouse_event.GetPosition().y() >= (plugin_dip_size_.height() - 1))) {
+      v_scrollbar_->ScrollBy(
+          PP_SCROLLBY_LINE, mouse_event.GetPosition().y() >= 0 ? 1: -1);
+      set_timer = true;
+    }
+    if (h_scrollbar_.get() &&
+        (mouse_event.GetPosition().x() <= 0 ||
+         mouse_event.GetPosition().x() >= (plugin_dip_size_.width() - 1))) {
+      h_scrollbar_->ScrollBy(PP_SCROLLBY_LINE,
+          mouse_event.GetPosition().x() >= 0 ? 1: -1);
+      set_timer = true;
+    }
+
+    if (set_timer) {
+      last_mouse_event_ = pp::MouseInputEvent(event);
+
+      pp::CompletionCallback callback =
+          timer_factory_.NewCallback(&Instance::OnTimerFired);
+      pp::Module::Get()->core()->CallOnMainThread(kDragTimerMs, callback);
+      timer_pending_ = true;
+    }
+  }
+
+  if (event.GetType() == PP_INPUTEVENT_TYPE_KEYDOWN &&
+      event.GetModifiers() & kDefaultKeyModifier) {
+    pp::KeyboardInputEvent keyboard_event(event);
+    switch (keyboard_event.GetKeyCode()) {
+      case 'A':
+        engine_->SelectAll();
+        return true;
+    }
+  }
+
+  // Return true for unhandled clicks so the plugin takes focus.
+  return (event.GetType() == PP_INPUTEVENT_TYPE_MOUSEDOWN);
+}
+
+void Instance::DidChangeView(const pp::View& view) {
+  pp::Rect view_rect(view.GetRect());
+  float device_scale = 1.0f;
+  float old_device_scale = device_scale_;
+  if (hidpi_enabled_)
+    device_scale = view.GetDeviceScale();
+  pp::Size view_device_size(view_rect.width() * device_scale,
+                            view_rect.height() * device_scale);
+  if (view_device_size == plugin_size_ && device_scale == device_scale_)
+    return;  // We don't care about the position, only the size.
+
+  image_data_ = pp::ImageData();
+  device_scale_ = device_scale;
+  plugin_dip_size_ = view_rect.size();
+  plugin_size_ = view_device_size;
+
+  paint_manager_.SetSize(view_device_size, device_scale_);
+
+  image_data_ = pp::ImageData(this,
+                              PP_IMAGEDATAFORMAT_BGRA_PREMUL,
+                              plugin_size_,
+                              false);
+  if (image_data_.is_null()) {
+    DCHECK(plugin_size_.IsEmpty());
+    return;
+  }
+
+  // View dimensions changed, disable autoscroll (if it was enabled).
+  DisableAutoscroll();
+
+  OnGeometryChanged(zoom_, old_device_scale);
+}
+
+pp::Var Instance::GetInstanceObject() {
+  if (instance_object_.is_undefined()) {
+    PDFScriptableObject* object = new PDFScriptableObject(this);
+    // The pp::Var takes ownership of object here.
+    instance_object_ = pp::VarPrivate(this, object);
+  }
+
+  return instance_object_;
+}
+
+pp::Var Instance::GetLinkAtPosition(const pp::Point& point) {
+  pp::Point offset_point(point);
+  ScalePoint(device_scale_, &offset_point);
+  offset_point.set_x(offset_point.x() - available_area_.x());
+  return engine_->GetLinkAtPosition(offset_point);
+}
+
+pp::Var Instance::GetSelectedText(bool html) {
+  if (html || !engine_->HasPermission(PDFEngine::PERMISSION_COPY))
+    return pp::Var();
+  return engine_->GetSelectedText();
+}
+
+void Instance::InvalidateWidget(pp::Widget_Dev widget,
+                                const pp::Rect& dirty_rect) {
+  if (v_scrollbar_.get() && *v_scrollbar_ == widget) {
+    if (!image_data_.is_null())
+      v_scrollbar_->Paint(dirty_rect.pp_rect(), &image_data_);
+  } else if (h_scrollbar_.get() && *h_scrollbar_ == widget) {
+    if (!image_data_.is_null())
+      h_scrollbar_->Paint(dirty_rect.pp_rect(), &image_data_);
+  } else {
+    // Possible to hit this condition since sometimes the scrollbar codes posts
+    // a task to do something later, and we could have deleted our reference in
+    // the meantime.
+    return;
+  }
+
+  pp::Rect dirty_rect_scaled = dirty_rect;
+  ScaleRect(device_scale_, &dirty_rect_scaled);
+  paint_manager_.InvalidateRect(dirty_rect_scaled);
+}
+
+void Instance::ScrollbarValueChanged(pp::Scrollbar_Dev scrollbar,
+                                     uint32_t value) {
+  value = GetScaled(value);
+  if (v_scrollbar_.get() && *v_scrollbar_ == scrollbar) {
+    engine_->ScrolledToYPosition(value);
+    pp::Rect rc;
+    v_scrollbar_->GetLocation(&rc);
+    int32 doc_height = GetDocumentPixelHeight();
+    doc_height -= GetScaled(rc.height());
+#ifdef ENABLE_THUMBNAILS
+    if (thumbnails_.visible()) {
+      thumbnails_.SetPosition(value, doc_height, true);
+    }
+#endif
+    pp::Point origin(
+        plugin_size_.width() - page_indicator_.rect().width() -
+            GetScaled(GetScrollbarReservedThickness()),
+        page_indicator_.GetYPosition(value, doc_height, plugin_size_.height()));
+    page_indicator_.MoveTo(origin, page_indicator_.visible());
+  } else if (h_scrollbar_.get() && *h_scrollbar_ == scrollbar) {
+    engine_->ScrolledToXPosition(value);
+  }
+}
+
+void Instance::ScrollbarOverlayChanged(pp::Scrollbar_Dev scrollbar,
+                                       bool overlay) {
+  scrollbar_reserved_thickness_ = overlay ? 0 : scrollbar_thickness_;
+  OnGeometryChanged(zoom_, device_scale_);
+}
+
+uint32_t Instance::QuerySupportedPrintOutputFormats() {
+  return engine_->QuerySupportedPrintOutputFormats();
+}
+
+int32_t Instance::PrintBegin(const PP_PrintSettings_Dev& print_settings) {
+  // For us num_pages is always equal to the number of pages in the PDF
+  // document irrespective of the printable area.
+  int32_t ret = engine_->GetNumberOfPages();
+  if (!ret)
+    return 0;
+
+  uint32_t supported_formats = engine_->QuerySupportedPrintOutputFormats();
+  if ((print_settings.format & supported_formats) == 0)
+    return 0;
+
+  print_settings_.is_printing = true;
+  print_settings_.pepper_print_settings = print_settings;
+  engine_->PrintBegin();
+  return ret;
+}
+
+pp::Resource Instance::PrintPages(
+    const PP_PrintPageNumberRange_Dev* page_ranges,
+    uint32_t page_range_count) {
+  if (!print_settings_.is_printing)
+    return pp::Resource();
+
+  print_settings_.print_pages_called_ = true;
+  return engine_->PrintPages(page_ranges, page_range_count,
+                             print_settings_.pepper_print_settings);
+}
+
+void Instance::PrintEnd() {
+  if (print_settings_.print_pages_called_)
+    UserMetricsRecordAction("PDF.PrintPage");
+  print_settings_.Clear();
+  engine_->PrintEnd();
+}
+
+bool Instance::IsPrintScalingDisabled() {
+  return !engine_->GetPrintScaling();
+}
+
+bool Instance::StartFind(const std::string& text, bool case_sensitive) {
+  engine_->StartFind(text.c_str(), case_sensitive);
+  return true;
+}
+
+void Instance::SelectFindResult(bool forward) {
+  engine_->SelectFindResult(forward);
+}
+
+void Instance::StopFind() {
+  engine_->StopFind();
+}
+
+void Instance::Zoom(double scale, bool text_only) {
+  UserMetricsRecordAction("PDF.ZoomFromBrowser");
+  SetZoom(ZOOM_SCALE, scale);
+}
+
+void Instance::ZoomChanged(double factor) {
+  if (full_)
+    Zoom_Dev::ZoomChanged(factor);
+}
+
+void Instance::OnPaint(const std::vector<pp::Rect>& paint_rects,
+                       std::vector<PaintManager::ReadyRect>* ready,
+                       std::vector<pp::Rect>* pending) {
+  if (image_data_.is_null()) {
+    DCHECK(plugin_size_.IsEmpty());
+    return;
+  }
+  if (first_paint_) {
+    first_paint_ = false;
+    pp::Rect rect = pp::Rect(pp::Point(), plugin_size_);
+    unsigned int color = kBackgroundColorA << 24 |
+                         kBackgroundColorR << 16 |
+                         kBackgroundColorG << 8 |
+                         kBackgroundColorB;
+    FillRect(rect, color);
+    ready->push_back(PaintManager::ReadyRect(rect, image_data_, true));
+    *pending = paint_rects;
+    return;
+  }
+
+  engine_->PrePaint();
+
+  for (size_t i = 0; i < paint_rects.size(); i++) {
+    // Intersect with plugin area since there could be pending invalidates from
+    // when the plugin area was larger.
+    pp::Rect rect =
+        paint_rects[i].Intersect(pp::Rect(pp::Point(), plugin_size_));
+    if (rect.IsEmpty())
+      continue;
+
+    pp::Rect pdf_rect = available_area_.Intersect(rect);
+    if (!pdf_rect.IsEmpty()) {
+      pdf_rect.Offset(available_area_.x() * -1, 0);
+
+      std::vector<pp::Rect> pdf_ready;
+      std::vector<pp::Rect> pdf_pending;
+      engine_->Paint(pdf_rect, &image_data_, &pdf_ready, &pdf_pending);
+      for (size_t j = 0; j < pdf_ready.size(); ++j) {
+        pdf_ready[j].Offset(available_area_.point());
+        ready->push_back(
+            PaintManager::ReadyRect(pdf_ready[j], image_data_, false));
+      }
+      for (size_t j = 0; j < pdf_pending.size(); ++j) {
+        pdf_pending[j].Offset(available_area_.point());
+        pending->push_back(pdf_pending[j]);
+      }
+    }
+
+    for (size_t j = 0; j < background_parts_.size(); ++j) {
+      pp::Rect intersection = background_parts_[j].location.Intersect(rect);
+      if (!intersection.IsEmpty()) {
+        FillRect(intersection, background_parts_[j].color);
+        ready->push_back(
+            PaintManager::ReadyRect(intersection, image_data_, false));
+      }
+    }
+
+    if (document_load_state_ == LOAD_STATE_FAILED) {
+      pp::Point top_center;
+      top_center.set_x(plugin_size_.width() / 2);
+      top_center.set_y(plugin_size_.height() / 2);
+      DrawText(top_center, PP_RESOURCESTRING_PDFLOAD_FAILED);
+    }
+
+#ifdef ENABLE_THUMBNAILS
+    thumbnails_.Paint(&image_data_, rect);
+#endif
+  }
+
+  engine_->PostPaint();
+
+  // Must paint scrollbars after the background parts, in case we have an
+  // overlay scrollbar that's over the background. We also do this in a separate
+  // loop because the scrollbar painting logic uses the signal of whether there
+  // are pending paints or not to figure out if it should draw right away or
+  // not.
+  for (size_t i = 0; i < paint_rects.size(); i++) {
+    PaintIfWidgetIntersects(h_scrollbar_.get(), paint_rects[i], ready, pending);
+    PaintIfWidgetIntersects(v_scrollbar_.get(), paint_rects[i], ready, pending);
+  }
+
+  if (progress_bar_.visible())
+    PaintOverlayControl(&progress_bar_, &image_data_, ready);
+
+  if (page_indicator_.visible())
+    PaintOverlayControl(&page_indicator_, &image_data_, ready);
+
+  if (toolbar_->current_transparency() != kTransparentAlpha)
+    PaintOverlayControl(toolbar_.get(), &image_data_, ready);
+
+  // Paint autoscroll anchor if needed.
+  if (is_autoscroll_) {
+    size_t limit = ready->size();
+    for (size_t i = 0; i < limit; i++) {
+      pp::Rect anchor_rect = autoscroll_rect_.Intersect((*ready)[i].rect);
+      if (!anchor_rect.IsEmpty()) {
+        pp::Rect draw_rc = pp::Rect(
+            pp::Point(anchor_rect.x() - autoscroll_rect_.x(),
+                      anchor_rect.y() - autoscroll_rect_.y()),
+            anchor_rect.size());
+        // Paint autoscroll anchor.
+        AlphaBlend(autoscroll_anchor_, draw_rc,
+                   &image_data_, anchor_rect.point(), kOpaqueAlpha);
+      }
+    }
+  }
+}
+
+void Instance::PaintOverlayControl(
+    Control* ctrl,
+    pp::ImageData* image_data,
+    std::vector<PaintManager::ReadyRect>* ready) {
+  // Make sure that we only paint overlay controls over an area that's ready,
+  // i.e. not pending.  Otherwise we'll mark the control rect as ready and
+  // it'll overwrite the pdf region.
+  std::list<pp::Rect> ctrl_rects;
+  for (size_t i = 0; i < ready->size(); i++) {
+    pp::Rect rc = ctrl->rect().Intersect((*ready)[i].rect);
+    if (!rc.IsEmpty())
+      ctrl_rects.push_back(rc);
+  }
+
+  if (!ctrl_rects.empty()) {
+    ctrl->PaintMultipleRects(image_data, ctrl_rects);
+
+    std::list<pp::Rect>::iterator iter;
+    for (iter = ctrl_rects.begin(); iter != ctrl_rects.end(); ++iter) {
+      ready->push_back(PaintManager::ReadyRect(*iter, *image_data, false));
+    }
+  }
+}
+
+void Instance::DidOpen(int32_t result) {
+  if (result == PP_OK) {
+    engine_->HandleDocumentLoad(embed_loader_);
+  } else if (result != PP_ERROR_ABORTED) {  // Can happen in tests.
+    NOTREACHED();
+  }
+}
+
+void Instance::DidOpenPreview(int32_t result) {
+  if (result == PP_OK) {
+    preview_engine_.reset(PDFEngine::Create(new PreviewModeClient(this)));
+    preview_engine_->HandleDocumentLoad(embed_preview_loader_);
+  } else {
+    NOTREACHED();
+  }
+}
+
+void Instance::PaintIfWidgetIntersects(
+    pp::Widget_Dev* widget,
+    const pp::Rect& rect,
+    std::vector<PaintManager::ReadyRect>* ready,
+    std::vector<pp::Rect>* pending) {
+  if (!widget)
+    return;
+
+  pp::Rect location;
+  if (!widget->GetLocation(&location))
+    return;
+
+  ScaleRect(device_scale_, &location);
+  location = location.Intersect(rect);
+  if (location.IsEmpty())
+    return;
+
+  if (IsOverlayScrollbar()) {
+    // If we're using overlay scrollbars, and there are pending paints under the
+    // scrollbar, don't update the scrollbar instantly. While it would be nice,
+    // we would need to double buffer the plugin area in order to make this
+    // work. This is because we'd need to always have a copy of what the pdf
+    // under the scrollbar looks like, and additionally we couldn't paint the
+    // pdf under the scrollbar if it's ready until we got the preceding flush.
+    // So in practice, it would make painting slower and introduce extra buffer
+    // copies for the general case.
+    for (size_t i = 0; i < pending->size(); ++i) {
+      if ((*pending)[i].Intersects(location))
+        return;
+    }
+
+    // Even if none of the pending paints are under the scrollbar, we never want
+    // to paint it if it's over the pdf if there are other pending paints.
+    // Otherwise different parts of the pdf plugin would display at different
+    // scroll offsets.
+    if (!pending->empty() && available_area_.Intersects(rect)) {
+      pending->push_back(location);
+      return;
+    }
+  }
+
+  pp::Rect location_dip = location;
+  ScaleRect(1.0f / device_scale_, &location_dip);
+
+  DCHECK(!image_data_.is_null());
+  widget->Paint(location_dip, &image_data_);
+
+  // Re-scale the rectangle from DIPs to device pixels, so we ensure that we
+  // don't miss any pixels due to rounding outwards in ScaleRect.
+  location = location_dip;
+  ScaleRect(device_scale_, &location);
+
+  ready->push_back(PaintManager::ReadyRect(location, image_data_, true));
+}
+
+void Instance::OnTimerFired(int32_t) {
+  HandleInputEvent(last_mouse_event_);
+}
+
+void Instance::OnClientTimerFired(int32_t id) {
+  engine_->OnCallback(id);
+}
+
+void Instance::OnControlTimerFired(int32_t,
+                                   const uint32& control_id,
+                                   const uint32& timer_id) {
+  if (control_id == toolbar_->id()) {
+    toolbar_->OnTimerFired(timer_id);
+  } else if (control_id == progress_bar_.id()) {
+    if (timer_id == delayed_progress_timer_id_) {
+      if (document_load_state_ == LOAD_STATE_LOADING &&
+          !progress_bar_.visible()) {
+        progress_bar_.Fade(true, kProgressFadeTimeoutMs);
+      }
+      delayed_progress_timer_id_ = 0;
+    } else {
+      progress_bar_.OnTimerFired(timer_id);
+    }
+  } else if (control_id == kAutoScrollId) {
+    if (is_autoscroll_) {
+      if (autoscroll_x_ != 0 && h_scrollbar_.get()) {
+        h_scrollbar_->ScrollBy(PP_SCROLLBY_PIXEL, autoscroll_x_);
+      }
+      if (autoscroll_y_ != 0 && v_scrollbar_.get()) {
+        v_scrollbar_->ScrollBy(PP_SCROLLBY_PIXEL, autoscroll_y_);
+      }
+
+      // Reschedule timer.
+      ScheduleTimer(kAutoScrollId, kAutoScrollTimeoutMs);
+    }
+  } else if (control_id == kPageIndicatorId) {
+    page_indicator_.OnTimerFired(timer_id);
+  }
+#ifdef ENABLE_THUMBNAILS
+  else if (control_id == thumbnails_.id()) {
+    thumbnails_.OnTimerFired(timer_id);
+  }
+#endif
+}
+
+void Instance::CalculateBackgroundParts() {
+  background_parts_.clear();
+  int v_scrollbar_thickness =
+      GetScaled(v_scrollbar_.get() ? GetScrollbarReservedThickness() : 0);
+  int h_scrollbar_thickness =
+      GetScaled(h_scrollbar_.get() ? GetScrollbarReservedThickness() : 0);
+  int width_without_scrollbar = std::max(
+      plugin_size_.width() - v_scrollbar_thickness, 0);
+  int height_without_scrollbar = std::max(
+      plugin_size_.height() - h_scrollbar_thickness, 0);
+  int left_width = available_area_.x();
+  int right_start = available_area_.right();
+  int right_width = abs(width_without_scrollbar - available_area_.right());
+  int bottom = std::min(available_area_.bottom(), height_without_scrollbar);
+
+  // Add the left, right, and bottom rectangles.  Note: we assume only
+  // horizontal centering.
+  BackgroundPart part;
+  part.color = kBackgroundColorA << 24 |
+               kBackgroundColorR << 16 |
+               kBackgroundColorG << 8 |
+               kBackgroundColorB;
+  part.location = pp::Rect(0, 0, left_width, bottom);
+  if (!part.location.IsEmpty())
+    background_parts_.push_back(part);
+  part.location = pp::Rect(right_start, 0, right_width, bottom);
+  if (!part.location.IsEmpty())
+    background_parts_.push_back(part);
+  part.location = pp::Rect(
+      0, bottom, width_without_scrollbar, height_without_scrollbar - bottom);
+  if (!part.location.IsEmpty())
+    background_parts_.push_back(part);
+
+  if (h_scrollbar_thickness
+#if defined(OS_MACOSX)
+      ||
+#else
+      &&
+#endif
+      v_scrollbar_thickness) {
+    part.color = 0xFFFFFFFF;
+    part.location = pp::Rect(plugin_size_.width() - v_scrollbar_thickness,
+                             plugin_size_.height() - h_scrollbar_thickness,
+                             h_scrollbar_thickness,
+                             v_scrollbar_thickness);
+    background_parts_.push_back(part);
+  }
+}
+
+int Instance::GetDocumentPixelWidth() const {
+  return static_cast<int>(ceil(document_size_.width() * zoom_ * device_scale_));
+}
+
+int Instance::GetDocumentPixelHeight() const {
+  return static_cast<int>(ceil(document_size_.height() *
+                               zoom_ *
+                               device_scale_));
+}
+
+void Instance::FillRect(const pp::Rect& rect, unsigned int color) {
+  DCHECK(!image_data_.is_null() || rect.IsEmpty());
+  unsigned int* buffer_start = static_cast<unsigned int*>(image_data_.data());
+  int stride = image_data_.stride();
+  unsigned int* ptr = buffer_start + rect.y() * stride / 4 + rect.x();
+  int height = rect.height();
+  int width = rect.width();
+  for (int y = 0; y < height; ++y) {
+    for (int x = 0; x < width; ++x)
+      *(ptr + x) = color;
+    ptr += stride /4;
+  }
+}
+
+void Instance::DocumentSizeUpdated(const pp::Size& size) {
+  document_size_ = size;
+
+  OnGeometryChanged(zoom_, device_scale_);
+}
+
+void Instance::Invalidate(const pp::Rect& rect) {
+  pp::Rect offset_rect(rect);
+  offset_rect.Offset(available_area_.point());
+  paint_manager_.InvalidateRect(offset_rect);
+}
+
+void Instance::Scroll(const pp::Point& point) {
+  pp::Rect scroll_area = available_area_;
+  if (IsOverlayScrollbar()) {
+    pp::Rect rc;
+    if (h_scrollbar_.get()) {
+      h_scrollbar_->GetLocation(&rc);
+      ScaleRect(device_scale_, &rc);
+      if (scroll_area.bottom() > rc.y()) {
+        scroll_area.set_height(rc.y() - scroll_area.y());
+        paint_manager_.InvalidateRect(rc);
+      }
+    }
+    if (v_scrollbar_.get()) {
+      v_scrollbar_->GetLocation(&rc);
+      ScaleRect(device_scale_, &rc);
+      if (scroll_area.right() > rc.x()) {
+        scroll_area.set_width(rc.x() - scroll_area.x());
+        paint_manager_.InvalidateRect(rc);
+      }
+    }
+  }
+  paint_manager_.ScrollRect(scroll_area, point);
+
+  if (toolbar_->current_transparency() != kTransparentAlpha)
+    paint_manager_.InvalidateRect(toolbar_->GetControlsRect());
+
+  if (progress_bar_.visible())
+    paint_manager_.InvalidateRect(progress_bar_.rect());
+
+  if (is_autoscroll_)
+    paint_manager_.InvalidateRect(autoscroll_rect_);
+
+  if (show_page_indicator_) {
+    page_indicator_.set_current_page(GetPageNumberToDisplay());
+    page_indicator_.Splash();
+  }
+
+  if (page_indicator_.visible())
+    paint_manager_.InvalidateRect(page_indicator_.rect());
+
+  if (on_scroll_callback_.is_string())
+    ExecuteScript(on_scroll_callback_);
+}
+
+void Instance::ScrollToX(int position) {
+  if (!h_scrollbar_.get()) {
+    NOTREACHED();
+    return;
+  }
+  int position_dip = static_cast<int>(position / device_scale_);
+  h_scrollbar_->SetValue(position_dip);
+}
+
+void Instance::ScrollToY(int position) {
+  if (!v_scrollbar_.get()) {
+    NOTREACHED();
+    return;
+  }
+  int position_dip = static_cast<int>(position / device_scale_);
+  v_scrollbar_->SetValue(ClipToRange(position_dip, 0, valid_v_range_));
+}
+
+void Instance::ScrollToPage(int page) {
+  if (!v_scrollbar_.get())
+    return;
+
+  if (engine_->GetNumberOfPages() == 0)
+    return;
+
+  int index = ClipToRange(page, 0, engine_->GetNumberOfPages() - 1);
+  pp::Rect rect = engine_->GetPageRect(index);
+  // If we are trying to scroll pass the last page,
+  // scroll to the end of the last page.
+  int position = index < page ? rect.bottom() : rect.y();
+  ScrollToY(position * zoom_ * device_scale_);
+}
+
+void Instance::NavigateTo(const std::string& url, bool open_in_new_tab) {
+  std::string url_copy(url);
+
+  // Empty |url_copy| is ok, and will effectively be a reload.
+  // Skip the code below so an empty URL does not turn into "http://", which
+  // will cause GURL to fail a DCHECK.
+  if (!url_copy.empty()) {
+    // If there's no scheme, add http.
+    if (url_copy.find("://") == std::string::npos &&
+        url_copy.find("mailto:") == std::string::npos) {
+      url_copy = std::string("http://") + url_copy;
+    }
+    // Make sure |url_copy| starts with a valid scheme.
+    if (url_copy.find("http://") != 0 &&
+        url_copy.find("https://") != 0 &&
+        url_copy.find("ftp://") != 0 &&
+        url_copy.find("mailto:") != 0) {
+      return;
+    }
+    // Make sure |url_copy| is not only a scheme.
+    if (url_copy == "http://" ||
+        url_copy == "https://" ||
+        url_copy == "ftp://" ||
+        url_copy == "mailto:") {
+      return;
+    }
+  }
+  if (open_in_new_tab) {
+    GetWindowObject().Call("open", url_copy);
+  } else {
+    GetWindowObject().GetProperty("top").GetProperty("location").
+        SetProperty("href", url_copy);
+  }
+}
+
+void Instance::UpdateCursor(PP_CursorType_Dev cursor) {
+  if (cursor == cursor_)
+    return;
+  cursor_ = cursor;
+
+  const PPB_CursorControl_Dev* cursor_interface =
+      reinterpret_cast<const PPB_CursorControl_Dev*>(
+      pp::Module::Get()->GetBrowserInterface(PPB_CURSOR_CONTROL_DEV_INTERFACE));
+  if (!cursor_interface) {
+    NOTREACHED();
+    return;
+  }
+
+  cursor_interface->SetCursor(
+      pp_instance(), cursor_, pp::ImageData().pp_resource(), NULL);
+}
+
+void Instance::UpdateTickMarks(const std::vector<pp::Rect>& tickmarks) {
+  if (!v_scrollbar_.get())
+    return;
+
+  float inverse_scale = 1.0f / device_scale_;
+  std::vector<pp::Rect> scaled_tickmarks = tickmarks;
+  for (size_t i = 0; i < scaled_tickmarks.size(); i++) {
+    ScaleRect(inverse_scale, &scaled_tickmarks[i]);
+  }
+
+  v_scrollbar_->SetTickMarks(
+      scaled_tickmarks.empty() ? NULL : &scaled_tickmarks[0], tickmarks.size());
+}
+
+void Instance::NotifyNumberOfFindResultsChanged(int total, bool final_result) {
+  NumberOfFindResultsChanged(total, final_result);
+}
+
+void Instance::NotifySelectedFindResultChanged(int current_find_index) {
+  SelectedFindResultChanged(current_find_index);
+}
+
+void Instance::OnEvent(uint32 control_id, uint32 event_id, void* data) {
+  if (event_id == Button::EVENT_ID_BUTTON_CLICKED ||
+      event_id == Button::EVENT_ID_BUTTON_STATE_CHANGED) {
+    switch (control_id) {
+      case kFitToPageButtonId:
+        UserMetricsRecordAction("PDF.FitToPageButton");
+        SetZoom(ZOOM_FIT_TO_PAGE, 0);
+        ZoomChanged(zoom_);
+        break;
+      case kFitToWidthButtonId:
+        UserMetricsRecordAction("PDF.FitToWidthButton");
+        SetZoom(ZOOM_FIT_TO_WIDTH, 0);
+        ZoomChanged(zoom_);
+        break;
+      case kZoomOutButtonId:
+      case kZoomInButtonId:
+        UserMetricsRecordAction(control_id == kZoomOutButtonId ?
+            "PDF.ZoomOutButton" : "PDF.ZoomInButton");
+        SetZoom(ZOOM_SCALE, CalculateZoom(control_id));
+        ZoomChanged(zoom_);
+        break;
+      case kSaveButtonId:
+        UserMetricsRecordAction("PDF.SaveButton");
+        SaveAs();
+        break;
+      case kPrintButtonId:
+        UserMetricsRecordAction("PDF.PrintButton");
+        Print();
+        break;
+    }
+  }
+  if (control_id == kThumbnailsId &&
+      event_id == ThumbnailControl::EVENT_ID_THUMBNAIL_SELECTED) {
+    int page = *static_cast<int*>(data);
+    pp::Rect page_rc(engine_->GetPageRect(page));
+    ScrollToY(static_cast<int>(page_rc.y() * zoom_ * device_scale_));
+  }
+}
+
+void Instance::Invalidate(uint32 control_id, const pp::Rect& rc) {
+  paint_manager_.InvalidateRect(rc);
+}
+
+uint32 Instance::ScheduleTimer(uint32 control_id, uint32 timeout_ms) {
+  current_timer_id_++;
+  pp::CompletionCallback callback =
+      timer_factory_.NewCallback(&Instance::OnControlTimerFired,
+                                 control_id,
+                                 current_timer_id_);
+  pp::Module::Get()->core()->CallOnMainThread(timeout_ms, callback);
+  return current_timer_id_;
+}
+
+void Instance::SetEventCapture(uint32 control_id, bool set_capture) {
+  // TODO(gene): set event capture here.
+}
+
+void Instance::SetCursor(uint32 control_id, PP_CursorType_Dev cursor_type) {
+  UpdateCursor(cursor_type);
+}
+
+pp::Instance* Instance::GetInstance() {
+  return this;
+}
+
+void Instance::GetDocumentPassword(
+    pp::CompletionCallbackWithOutput<pp::Var> callback) {
+  std::string message(GetLocalizedString(PP_RESOURCESTRING_PDFGETPASSWORD));
+  pp::Var result = pp::PDF::ModalPromptForPassword(this, message);
+  *callback.output() = result.pp_var();
+  callback.Run(PP_OK);
+}
+
+void Instance::Alert(const std::string& message) {
+  GetWindowObject().Call("alert", message);
+}
+
+bool Instance::Confirm(const std::string& message) {
+  pp::Var result = GetWindowObject().Call("confirm", message);
+  return result.is_bool() ? result.AsBool() : false;
+}
+
+std::string Instance::Prompt(const std::string& question,
+                             const std::string& default_answer) {
+  pp::Var result = GetWindowObject().Call("prompt", question, default_answer);
+  return result.is_string() ? result.AsString() : std::string();
+}
+
+std::string Instance::GetURL() {
+  return url_;
+}
+
+void Instance::Email(const std::string& to,
+                     const std::string& cc,
+                     const std::string& bcc,
+                     const std::string& subject,
+                     const std::string& body) {
+  std::string javascript =
+      "var href = 'mailto:" + net::EscapeUrlEncodedData(to, false) +
+      "?cc=" + net::EscapeUrlEncodedData(cc, false) +
+      "&bcc=" + net::EscapeUrlEncodedData(bcc, false) +
+      "&subject=" + net::EscapeUrlEncodedData(subject, false) +
+      "&body=" + net::EscapeUrlEncodedData(body, false) +
+      "';var temp = window.open(href, '_blank', " +
+      "'width=1,height=1');if(temp) temp.close();";
+  ExecuteScript(javascript);
+}
+
+void Instance::Print() {
+  if (!printing_enabled_ ||
+      (!engine_->HasPermission(PDFEngine::PERMISSION_PRINT_LOW_QUALITY) &&
+       !engine_->HasPermission(PDFEngine::PERMISSION_PRINT_HIGH_QUALITY))) {
+    return;
+  }
+
+  pp::CompletionCallback callback =
+      print_callback_factory_.NewCallback(&Instance::OnPrint);
+  pp::Module::Get()->core()->CallOnMainThread(0, callback);
+}
+
+void Instance::OnPrint(int32_t) {
+  pp::PDF::Print(this);
+}
+
+void Instance::SaveAs() {
+  pp::PDF::SaveAs(this);
+}
+
+void Instance::SubmitForm(const std::string& url,
+                          const void* data,
+                          int length) {
+  pp::URLRequestInfo request(this);
+  request.SetURL(url);
+  request.SetMethod("POST");
+  request.AppendDataToBody(reinterpret_cast<const char*>(data), length);
+
+  pp::CompletionCallback callback =
+      form_factory_.NewCallback(&Instance::FormDidOpen);
+  form_loader_ = CreateURLLoaderInternal();
+  int rv = form_loader_.Open(request, callback);
+  if (rv != PP_OK_COMPLETIONPENDING)
+    callback.Run(rv);
+}
+
+void Instance::FormDidOpen(int32_t result) {
+  // TODO: inform the user of success/failure.
+  if (result != PP_OK) {
+    NOTREACHED();
+  }
+}
+
+std::string Instance::ShowFileSelectionDialog() {
+  // Seems like very low priority to implement, since the pdf has no way to get
+  // the file data anyways.  Javascript doesn't let you do this synchronously.
+  NOTREACHED();
+  return std::string();
+}
+
+pp::URLLoader Instance::CreateURLLoader() {
+  if (full_) {
+    if (!did_call_start_loading_) {
+      did_call_start_loading_ = true;
+      pp::PDF::DidStartLoading(this);
+    }
+
+    // Disable save and print until the document is fully loaded, since they
+    // would generate an incomplete document.  Need to do this each time we
+    // call DidStartLoading since that resets the content restrictions.
+    pp::PDF::SetContentRestriction(this, CONTENT_RESTRICTION_SAVE |
+                                   CONTENT_RESTRICTION_PRINT);
+  }
+
+  return CreateURLLoaderInternal();
+}
+
+void Instance::ScheduleCallback(int id, int delay_in_ms) {
+  pp::CompletionCallback callback =
+      timer_factory_.NewCallback(&Instance::OnClientTimerFired);
+  pp::Module::Get()->core()->CallOnMainThread(delay_in_ms, callback, id);
+}
+
+void Instance::SearchString(const base::char16* string,
+                            const base::char16* term,
+                            bool case_sensitive,
+                            std::vector<SearchStringResult>* results) {
+  if (!pp::PDF::IsAvailable()) {
+    NOTREACHED();
+    return;
+  }
+
+  PP_PrivateFindResult* pp_results;
+  int count = 0;
+  pp::PDF::SearchString(
+      this,
+      reinterpret_cast<const unsigned short*>(string),
+      reinterpret_cast<const unsigned short*>(term),
+      case_sensitive,
+      &pp_results,
+      &count);
+
+  results->resize(count);
+  for (int i = 0; i < count; ++i) {
+    (*results)[i].start_index = pp_results[i].start_index;
+    (*results)[i].length = pp_results[i].length;
+  }
+
+  pp::Memory_Dev memory;
+  memory.MemFree(pp_results);
+}
+
+void Instance::DocumentPaintOccurred() {
+  if (painted_first_page_)
+    return;
+
+  painted_first_page_ = true;
+  UpdateToolbarPosition(false);
+  toolbar_->Splash(kToolbarSplashTimeoutMs);
+
+  if (engine_->GetNumberOfPages() > 1)
+    show_page_indicator_ = true;
+  else
+    show_page_indicator_ = false;
+
+  if (v_scrollbar_.get() && show_page_indicator_) {
+    page_indicator_.set_current_page(GetPageNumberToDisplay());
+    page_indicator_.Splash(kToolbarSplashTimeoutMs,
+                           kPageIndicatorInitialFadeTimeoutMs);
+  }
+}
+
+void Instance::DocumentLoadComplete(int page_count) {
+  // Clear focus state for OSK.
+  FormTextFieldFocusChange(false);
+
+  // Update progress control.
+  if (progress_bar_.visible())
+    progress_bar_.Fade(false, kProgressFadeTimeoutMs);
+
+  DCHECK(document_load_state_ == LOAD_STATE_LOADING);
+  document_load_state_ = LOAD_STATE_COMPLETE;
+  UserMetricsRecordAction("PDF.LoadSuccess");
+  if (on_load_callback_.is_string())
+    ExecuteScript(on_load_callback_);
+  // Note: If we are in print preview mode on_load_callback_ might call
+  // ScrollTo{X|Y}() and we don't want to scroll again and override it.
+  // #page=N is not supported in Print Preview.
+  if (!IsPrintPreview()) {
+    int initial_page = GetInitialPage(url_);
+    if (initial_page >= 0)
+      ScrollToPage(initial_page);
+  }
+
+  if (!full_)
+    return;
+  if (!pp::PDF::IsAvailable())
+    return;
+
+  if (did_call_start_loading_) {
+    pp::PDF::DidStopLoading(this);
+    did_call_start_loading_ = false;
+  }
+
+  int content_restrictions =
+      CONTENT_RESTRICTION_CUT | CONTENT_RESTRICTION_PASTE;
+  if (!engine_->HasPermission(PDFEngine::PERMISSION_COPY))
+    content_restrictions |= CONTENT_RESTRICTION_COPY;
+
+  if (!engine_->HasPermission(PDFEngine::PERMISSION_PRINT_LOW_QUALITY) &&
+      !engine_->HasPermission(PDFEngine::PERMISSION_PRINT_HIGH_QUALITY)) {
+    printing_enabled_ = false;
+    if (current_tb_info_ == kPDFToolbarButtons) {
+      // Remove Print button.
+      CreateToolbar(kPDFNoPrintToolbarButtons,
+                    arraysize(kPDFNoPrintToolbarButtons));
+      UpdateToolbarPosition(false);
+      Invalidate(pp::Rect(plugin_size_));
+    }
+  }
+
+  pp::PDF::SetContentRestriction(this, content_restrictions);
+
+  pp::PDF::HistogramPDFPageCount(this, page_count);
+}
+
+void Instance::RotateClockwise() {
+  engine_->RotateClockwise();
+}
+
+void Instance::RotateCounterclockwise() {
+  engine_->RotateCounterclockwise();
+}
+
+void Instance::PreviewDocumentLoadComplete() {
+  if (preview_document_load_state_ != LOAD_STATE_LOADING ||
+      preview_pages_info_.empty()) {
+    return;
+  }
+
+  preview_document_load_state_ = LOAD_STATE_COMPLETE;
+
+  int dest_page_index = preview_pages_info_.front().second;
+  int src_page_index =
+      ExtractPrintPreviewPageIndex(preview_pages_info_.front().first);
+  if (src_page_index > 0 &&  dest_page_index > -1 && preview_engine_.get())
+    engine_->AppendPage(preview_engine_.get(), dest_page_index);
+
+  preview_pages_info_.pop();
+  // |print_preview_page_count_| is not updated yet. Do not load any
+  // other preview pages till we get this information.
+  if (print_preview_page_count_ == 0)
+    return;
+
+  if (preview_pages_info_.size())
+    LoadAvailablePreviewPage();
+}
+
+void Instance::DocumentLoadFailed() {
+  DCHECK(document_load_state_ == LOAD_STATE_LOADING);
+  UserMetricsRecordAction("PDF.LoadFailure");
+
+  // Hide progress control.
+  progress_bar_.Fade(false, kProgressFadeTimeoutMs);
+
+  if (did_call_start_loading_) {
+    pp::PDF::DidStopLoading(this);
+    did_call_start_loading_ = false;
+  }
+
+  document_load_state_ = LOAD_STATE_FAILED;
+  paint_manager_.InvalidateRect(pp::Rect(pp::Point(), plugin_size_));
+}
+
+void Instance::PreviewDocumentLoadFailed() {
+  UserMetricsRecordAction("PDF.PreviewDocumentLoadFailure");
+  if (preview_document_load_state_ != LOAD_STATE_LOADING ||
+      preview_pages_info_.empty()) {
+    return;
+  }
+
+  preview_document_load_state_ = LOAD_STATE_FAILED;
+  preview_pages_info_.pop();
+
+  if (preview_pages_info_.size())
+    LoadAvailablePreviewPage();
+}
+
+pp::Instance* Instance::GetPluginInstance() {
+  return GetInstance();
+}
+
+void Instance::DocumentHasUnsupportedFeature(const std::string& feature) {
+  std::string metric("PDF_Unsupported_");
+  metric += feature;
+  if (!unsupported_features_reported_.count(metric)) {
+    unsupported_features_reported_.insert(metric);
+    UserMetricsRecordAction(metric);
+  }
+
+  // Since we use an info bar, only do this for full frame plugins..
+  if (!full_)
+    return;
+
+  if (told_browser_about_unsupported_feature_)
+    return;
+  told_browser_about_unsupported_feature_ = true;
+
+  pp::PDF::HasUnsupportedFeature(this);
+}
+
+void Instance::DocumentLoadProgress(uint32 available, uint32 doc_size) {
+  double progress = 0.0;
+  if (doc_size == 0) {
+    // Document size is unknown. Use heuristics.
+    // We'll make progress logarithmic from 0 to 100M.
+    static const double kFactor = log(100000000.0) / 100.0;
+    if (available > 0) {
+      progress = log(static_cast<double>(available)) / kFactor;
+      if (progress > 100.0)
+        progress = 100.0;
+    }
+  } else {
+    progress = 100.0 * static_cast<double>(available) / doc_size;
+  }
+  progress_bar_.SetProgress(progress);
+}
+
+void Instance::FormTextFieldFocusChange(bool in_focus) {
+  if (!text_input_.get())
+    return;
+  if (in_focus)
+    text_input_->SetTextInputType(PP_TEXTINPUT_TYPE_DEV_TEXT);
+  else
+    text_input_->SetTextInputType(PP_TEXTINPUT_TYPE_DEV_NONE);
+}
+
+// Called by PDFScriptableObject.
+bool Instance::HasScriptableMethod(const pp::Var& method, pp::Var* exception) {
+  std::string method_str = method.AsString();
+  return (method_str == kJSAccessibility ||
+          method_str == kJSDocumentLoadComplete ||
+          method_str == kJSGetHeight ||
+          method_str == kJSGetHorizontalScrollbarThickness ||
+          method_str == kJSGetPageLocationNormalized ||
+          method_str == kJSGetVerticalScrollbarThickness ||
+          method_str == kJSGetWidth ||
+          method_str == kJSGetZoomLevel ||
+          method_str == kJSGoToPage ||
+          method_str == kJSGrayscale ||
+          method_str == kJSLoadPreviewPage ||
+          method_str == kJSOnLoad ||
+          method_str == kJSOnPluginSizeChanged ||
+          method_str == kJSOnScroll ||
+          method_str == kJSPageXOffset ||
+          method_str == kJSPageYOffset ||
+          method_str == kJSPrintPreviewPageCount ||
+          method_str == kJSReload ||
+          method_str == kJSRemovePrintButton ||
+          method_str == kJSResetPrintPreviewUrl ||
+          method_str == kJSSendKeyEvent ||
+          method_str == kJSSetPageNumbers ||
+          method_str == kJSSetPageXOffset ||
+          method_str == kJSSetPageYOffset ||
+          method_str == kJSSetZoomLevel ||
+          method_str == kJSZoomFitToHeight ||
+          method_str == kJSZoomFitToWidth ||
+          method_str == kJSZoomIn ||
+          method_str == kJSZoomOut);
+}
+
+pp::Var Instance::CallScriptableMethod(const pp::Var& method,
+                                       const std::vector<pp::Var>& args,
+                                       pp::Var* exception) {
+  std::string method_str = method.AsString();
+  if (method_str == kJSGrayscale) {
+    if (args.size() == 1 && args[0].is_bool()) {
+      engine_->SetGrayscale(args[0].AsBool());
+      // Redraw
+      paint_manager_.InvalidateRect(pp::Rect(pp::Point(), plugin_size_));
+#ifdef ENABLE_THUMBNAILS
+      if (thumbnails_.visible())
+        thumbnails_.Show(true, true);
+#endif
+      return pp::Var(true);
+    }
+    return pp::Var(false);
+  }
+  if (method_str == kJSOnLoad) {
+    if (args.size() == 1 && args[0].is_string()) {
+      on_load_callback_ = args[0];
+      return pp::Var(true);
+    }
+    return pp::Var(false);
+  }
+  if (method_str == kJSOnScroll) {
+    if (args.size() == 1 && args[0].is_string()) {
+      on_scroll_callback_ = args[0];
+      return pp::Var(true);
+    }
+    return pp::Var(false);
+  }
+  if (method_str == kJSOnPluginSizeChanged) {
+    if (args.size() == 1 && args[0].is_string()) {
+      on_plugin_size_changed_callback_ = args[0];
+      return pp::Var(true);
+    }
+    return pp::Var(false);
+  }
+  if (method_str == kJSReload) {
+    document_load_state_ = LOAD_STATE_LOADING;
+    if (!full_)
+      LoadUrl(url_);
+    preview_engine_.reset();
+    print_preview_page_count_ = 0;
+    engine_.reset(PDFEngine::Create(this));
+    engine_->New(url_.c_str());
+#ifdef ENABLE_THUMBNAILS
+    thumbnails_.ResetEngine(engine_.get());
+#endif
+    return pp::Var();
+  }
+  if (method_str == kJSResetPrintPreviewUrl) {
+    if (args.size() == 1 && args[0].is_string()) {
+      url_ = args[0].AsString();
+      preview_pages_info_ = std::queue<PreviewPageInfo>();
+      preview_document_load_state_ = LOAD_STATE_COMPLETE;
+    }
+    return pp::Var();
+  }
+  if (method_str == kJSZoomFitToHeight) {
+    SetZoom(ZOOM_FIT_TO_PAGE, 0);
+    return pp::Var();
+  }
+  if (method_str == kJSZoomFitToWidth) {
+    SetZoom(ZOOM_FIT_TO_WIDTH, 0);
+    return pp::Var();
+  }
+  if (method_str == kJSZoomIn) {
+    SetZoom(ZOOM_SCALE, CalculateZoom(kZoomInButtonId));
+    return pp::Var();
+  }
+  if (method_str == kJSZoomOut) {
+    SetZoom(ZOOM_SCALE, CalculateZoom(kZoomOutButtonId));
+    return pp::Var();
+  }
+  if (method_str == kJSSetZoomLevel) {
+    if (args.size() == 1 && args[0].is_double())
+      SetZoom(ZOOM_SCALE, args[0].AsDouble());
+    return pp::Var();
+  }
+  if (method_str == kJSGetZoomLevel) {
+    return pp::Var(zoom_);
+  }
+  if (method_str == kJSGetHeight) {
+    return pp::Var(plugin_size_.height());
+  }
+  if (method_str == kJSGetWidth) {
+    return pp::Var(plugin_size_.width());
+  }
+  if (method_str == kJSGetHorizontalScrollbarThickness) {
+    return pp::Var(
+          h_scrollbar_.get() ? GetScrollbarReservedThickness() : 0);
+  }
+  if (method_str == kJSGetVerticalScrollbarThickness) {
+    return pp::Var(
+          v_scrollbar_.get() ? GetScrollbarReservedThickness() : 0);
+  }
+  if (method_str == kJSDocumentLoadComplete) {
+    return pp::Var((document_load_state_ != LOAD_STATE_LOADING));
+  }
+  if (method_str == kJSPageYOffset) {
+    return pp::Var(static_cast<int32_t>(
+        v_scrollbar_.get() ? v_scrollbar_->GetValue() : 0));
+  }
+  if (method_str == kJSSetPageYOffset) {
+    if (args.size() == 1 && args[0].is_number() && v_scrollbar_.get())
+      ScrollToY(GetScaled(args[0].AsInt()));
+    return pp::Var();
+  }
+  if (method_str == kJSPageXOffset) {
+    return pp::Var(static_cast<int32_t>(
+        h_scrollbar_.get() ? h_scrollbar_->GetValue() : 0));
+  }
+  if (method_str == kJSSetPageXOffset) {
+    if (args.size() == 1 && args[0].is_number() && h_scrollbar_.get())
+      ScrollToX(GetScaled(args[0].AsInt()));
+    return pp::Var();
+  }
+  if (method_str == kJSRemovePrintButton) {
+    CreateToolbar(kPrintPreviewToolbarButtons,
+                  arraysize(kPrintPreviewToolbarButtons));
+    UpdateToolbarPosition(false);
+    Invalidate(pp::Rect(plugin_size_));
+    return pp::Var();
+  }
+  if (method_str == kJSGoToPage) {
+    if (args.size() == 1 && args[0].is_string()) {
+      ScrollToPage(atoi(args[0].AsString().c_str()));
+    }
+    return pp::Var();
+  }
+  if (method_str == kJSAccessibility) {
+    if (args.size() == 0) {
+      base::DictionaryValue node;
+      node.SetInteger(kAccessibleNumberOfPages, engine_->GetNumberOfPages());
+      node.SetBoolean(kAccessibleLoaded,
+                      document_load_state_ != LOAD_STATE_LOADING);
+      bool has_permissions =
+          engine_->HasPermission(PDFEngine::PERMISSION_COPY) ||
+          engine_->HasPermission(PDFEngine::PERMISSION_COPY_ACCESSIBLE);
+      node.SetBoolean(kAccessibleCopyable, has_permissions);
+      std::string json;
+      base::JSONWriter::Write(&node, &json);
+      return pp::Var(json);
+    } else if (args[0].is_number()) {
+      return pp::Var(engine_->GetPageAsJSON(args[0].AsInt()));
+    }
+  }
+  if (method_str == kJSPrintPreviewPageCount) {
+    if (args.size() == 1 && args[0].is_number())
+      SetPrintPreviewMode(args[0].AsInt());
+    return pp::Var();
+  }
+  if (method_str == kJSLoadPreviewPage) {
+    if (args.size() == 2 && args[0].is_string() && args[1].is_number())
+      ProcessPreviewPageInfo(args[0].AsString(), args[1].AsInt());
+    return pp::Var();
+  }
+  if (method_str == kJSGetPageLocationNormalized) {
+    const size_t kMaxLength = 30;
+    char location_info[kMaxLength];
+    int page_idx = engine_->GetMostVisiblePage();
+    if (page_idx < 0)
+      return pp::Var(std::string());
+    pp::Rect rect = engine_->GetPageContentsRect(page_idx);
+    int v_scrollbar_reserved_thickness =
+        v_scrollbar_.get() ? GetScaled(GetScrollbarReservedThickness()) : 0;
+
+    rect.set_x(rect.x() + ((plugin_size_.width() -
+        v_scrollbar_reserved_thickness - available_area_.width()) / 2));
+    base::snprintf(location_info,
+                   kMaxLength,
+                   "%0.4f;%0.4f;%0.4f;%0.4f;",
+                   rect.x() / static_cast<float>(plugin_size_.width()),
+                   rect.y() / static_cast<float>(plugin_size_.height()),
+                   rect.width() / static_cast<float>(plugin_size_.width()),
+                   rect.height()/ static_cast<float>(plugin_size_.height()));
+    return pp::Var(std::string(location_info));
+  }
+  if (method_str == kJSSetPageNumbers) {
+    if (args.size() != 1 || !args[0].is_string())
+      return pp::Var();
+    const int num_pages_signed = engine_->GetNumberOfPages();
+    if (num_pages_signed <= 0)
+      return pp::Var();
+    scoped_ptr<base::ListValue> page_ranges(static_cast<base::ListValue*>(
+        base::JSONReader::Read(args[0].AsString(), false)));
+    const size_t num_pages = static_cast<size_t>(num_pages_signed);
+    if (!page_ranges.get() || page_ranges->GetSize() != num_pages)
+      return pp::Var();
+
+    std::vector<int> print_preview_page_numbers;
+    for (size_t index = 0; index < num_pages; ++index) {
+      int page_number = 0;  // |page_number| is 1-based.
+      if (!page_ranges->GetInteger(index, &page_number) || page_number < 1)
+        return pp::Var();
+      print_preview_page_numbers.push_back(page_number);
+    }
+    print_preview_page_numbers_ = print_preview_page_numbers;
+    page_indicator_.set_current_page(GetPageNumberToDisplay());
+    return pp::Var();
+  }
+  // This is here to work around https://bugs.webkit.org/show_bug.cgi?id=16735.
+  // In JS, creating a synthetic keyboard event and dispatching it always
+  // result in a keycode of 0.
+  if (method_str == kJSSendKeyEvent) {
+    if (args.size() == 1 && args[0].is_number()) {
+      pp::KeyboardInputEvent event(
+          this,                        // instance
+          PP_INPUTEVENT_TYPE_KEYDOWN,  // HandleInputEvent only care about this.
+          0,                           // timestamp, not used for kbd events.
+          0,                           // no modifiers.
+          args[0].AsInt(),             // keycode.
+          pp::Var());                  // no char text needed.
+      HandleInputEvent(event);
+    }
+  }
+  return pp::Var();
+}
+
+void Instance::OnGeometryChanged(double old_zoom, float old_device_scale) {
+  bool force_no_horizontal_scrollbar = false;
+  int scrollbar_thickness = GetScrollbarThickness();
+
+  if (old_device_scale != device_scale_) {
+    // Change in device scale forces us to recreate resources
+    ConfigureNumberImageGenerator();
+
+    CreateToolbar(current_tb_info_, current_tb_info_size_);
+    // Load autoscroll anchor image.
+    autoscroll_anchor_ =
+        CreateResourceImage(PP_RESOURCEIMAGE_PDF_PAN_SCROLL_ICON);
+
+    ConfigurePageIndicator();
+    ConfigureProgressBar();
+
+    pp::Point scroll_position = engine_->GetScrollPosition();
+    ScalePoint(device_scale_ / old_device_scale, &scroll_position);
+    engine_->SetScrollPosition(scroll_position);
+  }
+
+  UpdateZoomScale();
+  if (zoom_ != old_zoom || device_scale_ != old_device_scale)
+    engine_->ZoomUpdated(zoom_ * device_scale_);
+  if (zoom_ != old_zoom)
+    ZoomChanged(zoom_);
+
+  available_area_ = pp::Rect(plugin_size_);
+  if (GetDocumentPixelHeight() > plugin_size_.height()) {
+    CreateVerticalScrollbar();
+  } else {
+    DestroyVerticalScrollbar();
+  }
+
+  int v_scrollbar_reserved_thickness =
+      v_scrollbar_.get() ? GetScaled(GetScrollbarReservedThickness()) : 0;
+
+  if (!force_no_horizontal_scrollbar &&
+      GetDocumentPixelWidth() >
+      (plugin_size_.width() - v_scrollbar_reserved_thickness)) {
+    CreateHorizontalScrollbar();
+
+    // Adding the horizontal scrollbar now might cause us to need vertical
+    // scrollbars.
+    if (GetDocumentPixelHeight() >
+        plugin_size_.height() - GetScaled(GetScrollbarReservedThickness())) {
+      CreateVerticalScrollbar();
+    }
+
+  } else {
+    DestroyHorizontalScrollbar();
+  }
+
+#ifdef ENABLE_THUMBNAILS
+  int thumbnails_pos = 0, thumbnails_total = 0;
+#endif
+  if (v_scrollbar_.get()) {
+    v_scrollbar_->SetScale(device_scale_);
+    available_area_.set_width(
+      std::max(0, plugin_size_.width() - v_scrollbar_reserved_thickness));
+
+#ifdef ENABLE_THUMBNAILS
+    int height = plugin_size_.height();
+#endif
+    int height_dip = plugin_dip_size_.height();
+
+#if defined(OS_MACOSX)
+    // Before Lion, Mac always had the resize at the bottom. After that, it
+    // never did.
+    if ((base::mac::IsOSSnowLeopard() && full_) ||
+        (base::mac::IsOSLionOrLater() && h_scrollbar_.get())) {
+#else
+    if (h_scrollbar_.get()) {
+#endif  // defined(OS_MACOSX)
+#ifdef ENABLE_THUMBNAILS
+      height -= GetScaled(GetScrollbarThickness());
+#endif
+      height_dip -= GetScrollbarThickness();
+    }
+#ifdef ENABLE_THUMBNAILS
+    int32 doc_height = GetDocumentPixelHeight();
+#endif
+    int32 doc_height_dip =
+        static_cast<int32>(GetDocumentPixelHeight() / device_scale_);
+#if defined(OS_MACOSX)
+    // On the Mac we always allow room for the resize button (whose width is
+    // the same as that of the scrollbar) in full mode. However, if there is no
+    // no horizontal scrollbar, the end of the scrollbar will scroll past the
+    // end of the document. This is because the scrollbar assumes that its own
+    // height (in the case of a vscroll bar) is the same as the height of the
+    // viewport. Since the viewport is actually larger, we compensate by
+    // adjusting the document height. Similar logic applies below for the
+    // horizontal scrollbar.
+    // For example, if the document size is 1000, and the viewport size is 200,
+    // then the scrollbar position at the end will be 800. In this case the
+    // viewport is actally 215 (assuming 15 as the scrollbar width) but the
+    // scrollbar thinks it is 200. We want the scrollbar position at the end to
+    // be 785. Making the document size 985 achieves this.
+    if (full_ && !h_scrollbar_.get()) {
+#ifdef ENABLE_THUMBNAILS
+      doc_height -= GetScaled(GetScrollbarThickness());
+#endif
+      doc_height_dip -= GetScrollbarThickness();
+    }
+#endif  // defined(OS_MACOSX)
+
+    int32 position;
+    position = v_scrollbar_->GetValue();
+    position = static_cast<int>(position * zoom_ / old_zoom);
+    valid_v_range_ = doc_height_dip - height_dip;
+    if (position > valid_v_range_)
+      position = valid_v_range_;
+
+    v_scrollbar_->SetValue(position);
+
+    PP_Rect loc;
+    loc.point.x = static_cast<int>(available_area_.right() / device_scale_);
+    if (IsOverlayScrollbar())
+      loc.point.x -= scrollbar_thickness;
+    loc.point.y = 0;
+    loc.size.width = scrollbar_thickness;
+    loc.size.height = height_dip;
+    v_scrollbar_->SetLocation(loc);
+    v_scrollbar_->SetDocumentSize(doc_height_dip);
+
+#ifdef ENABLE_THUMBNAILS
+    thumbnails_pos = position;
+    thumbnails_total = doc_height - height;
+#endif
+  }
+
+  if (h_scrollbar_.get()) {
+    h_scrollbar_->SetScale(device_scale_);
+    available_area_.set_height(
+        std::max(0, plugin_size_.height() -
+                    GetScaled(GetScrollbarReservedThickness())));
+
+    int width_dip = plugin_dip_size_.width();
+
+    // See note above.
+#if defined(OS_MACOSX)
+    if ((base::mac::IsOSSnowLeopard() && full_) ||
+        (base::mac::IsOSLionOrLater() && v_scrollbar_.get())) {
+#else
+    if (v_scrollbar_.get()) {
+#endif
+      width_dip -= GetScrollbarThickness();
+    }
+    int32 doc_width_dip =
+        static_cast<int32>(GetDocumentPixelWidth() / device_scale_);
+#if defined(OS_MACOSX)
+    // See comment in the above if (v_scrollbar_.get()) block.
+    if (full_ && !v_scrollbar_.get())
+      doc_width_dip -= GetScrollbarThickness();
+#endif  // defined(OS_MACOSX)
+
+    int32 position;
+    position = h_scrollbar_->GetValue();
+    position = static_cast<int>(position * zoom_ / old_zoom);
+    position = std::min(position, doc_width_dip - width_dip);
+
+    h_scrollbar_->SetValue(position);
+
+    PP_Rect loc;
+    loc.point.x = 0;
+    loc.point.y = static_cast<int>(available_area_.bottom() / device_scale_);
+    if (IsOverlayScrollbar())
+      loc.point.y -= scrollbar_thickness;
+    loc.size.width = width_dip;
+    loc.size.height = scrollbar_thickness;
+    h_scrollbar_->SetLocation(loc);
+    h_scrollbar_->SetDocumentSize(doc_width_dip);
+  }
+
+  int doc_width = GetDocumentPixelWidth();
+  if (doc_width < available_area_.width()) {
+    available_area_.Offset((available_area_.width() - doc_width) / 2, 0);
+    available_area_.set_width(doc_width);
+  }
+  int doc_height = GetDocumentPixelHeight();
+  if (doc_height < available_area_.height()) {
+    available_area_.set_height(doc_height);
+  }
+
+  // We'll invalidate the entire plugin anyways.
+  UpdateToolbarPosition(false);
+  UpdateProgressBarPosition(false);
+  UpdatePageIndicatorPosition(false);
+
+#ifdef ENABLE_THUMBNAILS
+  // Update thumbnail control position.
+  thumbnails_.SetPosition(thumbnails_pos, thumbnails_total, false);
+  pp::Rect thumbnails_rc(plugin_size_.width() - GetScaled(kThumbnailsWidth), 0,
+    GetScaled(kThumbnailsWidth), plugin_size_.height());
+  if (v_scrollbar_.get())
+    thumbnails_rc.Offset(-v_scrollbar_reserved_thickness, 0);
+  if (h_scrollbar_.get())
+    thumbnails_rc.Inset(0, 0, 0, v_scrollbar_reserved_thickness);
+  thumbnails_.SetRect(thumbnails_rc, false);
+#endif
+
+  CalculateBackgroundParts();
+  engine_->PageOffsetUpdated(available_area_.point());
+  engine_->PluginSizeUpdated(available_area_.size());
+
+  if (!document_size_.GetArea())
+    return;
+  paint_manager_.InvalidateRect(pp::Rect(pp::Point(), plugin_size_));
+
+  if (on_plugin_size_changed_callback_.is_string())
+    ExecuteScript(on_plugin_size_changed_callback_);
+}
+
+void Instance::CreateHorizontalScrollbar() {
+  if (h_scrollbar_.get())
+    return;
+
+  h_scrollbar_.reset(new pp::Scrollbar_Dev(this, false));
+}
+
+void Instance::CreateVerticalScrollbar() {
+  if (v_scrollbar_.get())
+    return;
+
+  v_scrollbar_.reset(new pp::Scrollbar_Dev(this, true));
+}
+
+void Instance::DestroyHorizontalScrollbar() {
+  if (!h_scrollbar_.get())
+    return;
+  if (h_scrollbar_->GetValue())
+    engine_->ScrolledToXPosition(0);
+  h_scrollbar_.reset();
+}
+
+void Instance::DestroyVerticalScrollbar() {
+  if (!v_scrollbar_.get())
+    return;
+  if (v_scrollbar_->GetValue())
+    engine_->ScrolledToYPosition(0);
+  v_scrollbar_.reset();
+  page_indicator_.Show(false, true);
+}
+
+int Instance::GetScrollbarThickness() {
+  if (scrollbar_thickness_ == -1) {
+    pp::Scrollbar_Dev temp_scrollbar(this, false);
+    scrollbar_thickness_ = temp_scrollbar.GetThickness();
+    scrollbar_reserved_thickness_ =
+      temp_scrollbar.IsOverlay() ? 0 : scrollbar_thickness_;
+  }
+
+  return scrollbar_thickness_;
+}
+
+int Instance::GetScrollbarReservedThickness() {
+  GetScrollbarThickness();
+  return scrollbar_reserved_thickness_;
+}
+
+bool Instance::IsOverlayScrollbar() {
+  return GetScrollbarReservedThickness() == 0;
+}
+
+void Instance::CreateToolbar(const ToolbarButtonInfo* tb_info, size_t size) {
+  toolbar_.reset(new FadingControls());
+
+  DCHECK(tb_info);
+  DCHECK(size >= 0);
+
+  // Remember the current toolbar information in case we need to recreate the
+  // images later.
+  current_tb_info_ = tb_info;
+  current_tb_info_size_ = size;
+
+  int max_height = 0;
+  pp::Point origin(kToolbarFadingOffsetLeft, kToolbarFadingOffsetTop);
+  ScalePoint(device_scale_, &origin);
+
+  std::list<Button*> buttons;
+  for (size_t i = 0; i < size; i++) {
+    Button* btn = new Button;
+    pp::ImageData normal_face =
+        CreateResourceImage(tb_info[i].normal);
+    btn->CreateButton(tb_info[i].id,
+                      origin,
+                      true,
+                      toolbar_.get(),
+                      tb_info[i].style,
+                      normal_face,
+                      CreateResourceImage(tb_info[i].highlighted),
+                      CreateResourceImage(tb_info[i].pressed));
+    buttons.push_back(btn);
+
+    origin += pp::Point(normal_face.size().width(), 0);
+    max_height = std::max(max_height, normal_face.size().height());
+  }
+
+  pp::Rect rc_toolbar(0, 0,
+      origin.x() + GetToolbarRightOffset(),
+      origin.y() + max_height + GetToolbarBottomOffset());
+  toolbar_->CreateFadingControls(
+      kToolbarId, rc_toolbar, false, this, kTransparentAlpha);
+
+  std::list<Button*>::iterator iter;
+  for (iter = buttons.begin(); iter != buttons.end(); ++iter) {
+    toolbar_->AddControl(*iter);
+  }
+}
+
+int Instance::GetToolbarRightOffset() {
+  int scrollbar_thickness = GetScrollbarThickness();
+  return GetScaled(kToolbarFadingOffsetRight) + 2 * scrollbar_thickness;
+}
+
+int Instance::GetToolbarBottomOffset() {
+  int scrollbar_thickness = GetScrollbarThickness();
+  return GetScaled(kToolbarFadingOffsetBottom) + scrollbar_thickness;
+}
+
+std::vector<pp::ImageData> Instance::GetThumbnailResources() {
+  std::vector<pp::ImageData> num_images(10);
+  num_images[0] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_0);
+  num_images[1] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_1);
+  num_images[2] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_2);
+  num_images[3] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_3);
+  num_images[4] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_4);
+  num_images[5] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_5);
+  num_images[6] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_6);
+  num_images[7] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_7);
+  num_images[8] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_8);
+  num_images[9] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_9);
+  return num_images;
+}
+
+std::vector<pp::ImageData> Instance::GetProgressBarResources(
+    pp::ImageData* background) {
+  std::vector<pp::ImageData> result(9);
+  result[0] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_0);
+  result[1] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_1);
+  result[2] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_2);
+  result[3] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_3);
+  result[4] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_4);
+  result[5] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_5);
+  result[6] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_6);
+  result[7] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_7);
+  result[8] = CreateResourceImage(PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_8);
+  *background = CreateResourceImage(
+      PP_RESOURCEIMAGE_PDF_PROGRESS_BAR_BACKGROUND);
+  return result;
+}
+
+void Instance::CreatePageIndicator(bool always_visible) {
+  page_indicator_.CreatePageIndicator(kPageIndicatorId, false, this,
+      number_image_generator(), always_visible);
+  ConfigurePageIndicator();
+}
+
+void Instance::ConfigurePageIndicator() {
+  pp::ImageData background =
+      CreateResourceImage(PP_RESOURCEIMAGE_PDF_PAGE_INDICATOR_BACKGROUND);
+  page_indicator_.Configure(pp::Point(), background);
+}
+
+void Instance::CreateProgressBar() {
+  pp::ImageData background;
+  std::vector<pp::ImageData> images = GetProgressBarResources(&background);
+  std::string text = GetLocalizedString(PP_RESOURCESTRING_PDFPROGRESSLOADING);
+  progress_bar_.CreateProgressControl(kProgressBarId, false, this, 0.0,
+      device_scale_, images, background, text);
+}
+
+void Instance::ConfigureProgressBar() {
+  pp::ImageData background;
+  std::vector<pp::ImageData> images = GetProgressBarResources(&background);
+  progress_bar_.Reconfigure(background, images, device_scale_);
+}
+
+void Instance::CreateThumbnails() {
+  thumbnails_.CreateThumbnailControl(
+      kThumbnailsId, pp::Rect(), false, this, engine_.get(),
+      number_image_generator());
+}
+
+void Instance::LoadUrl(const std::string& url) {
+  LoadUrlInternal(url, &embed_loader_, &Instance::DidOpen);
+}
+
+void Instance::LoadPreviewUrl(const std::string& url) {
+  LoadUrlInternal(url, &embed_preview_loader_, &Instance::DidOpenPreview);
+}
+
+void Instance::LoadUrlInternal(const std::string& url, pp::URLLoader* loader,
+                               void (Instance::* method)(int32_t)) {
+  pp::URLRequestInfo request(this);
+  request.SetURL(url);
+  request.SetMethod("GET");
+
+  *loader = CreateURLLoaderInternal();
+  pp::CompletionCallback callback = loader_factory_.NewCallback(method);
+  int rv = loader->Open(request, callback);
+  if (rv != PP_OK_COMPLETIONPENDING)
+    callback.Run(rv);
+}
+
+pp::URLLoader Instance::CreateURLLoaderInternal() {
+  pp::URLLoader loader(this);
+
+  const PPB_URLLoaderTrusted* trusted_interface =
+      reinterpret_cast<const PPB_URLLoaderTrusted*>(
+          pp::Module::Get()->GetBrowserInterface(
+              PPB_URLLOADERTRUSTED_INTERFACE));
+  if (trusted_interface)
+    trusted_interface->GrantUniversalAccess(loader.pp_resource());
+  return loader;
+}
+
+int Instance::GetInitialPage(const std::string& url) {
+#if defined(OS_NACL)
+  return -1;
+#else
+  size_t found_idx = url.find('#');
+  if (found_idx == std::string::npos)
+    return -1;
+
+  const std::string& ref = url.substr(found_idx + 1);
+  std::vector<std::string> fragments;
+  Tokenize(ref, kDelimiters, &fragments);
+
+  // Page number to return, zero-based.
+  int page = -1;
+
+  // Handle the case of http://foo.com/bar#NAMEDDEST. This is not explicitly
+  // mentioned except by example in the Adobe "PDF Open Parameters" document.
+  if ((fragments.size() == 1) && (fragments[0].find('=') == std::string::npos))
+    return engine_->GetNamedDestinationPage(fragments[0]);
+
+  for (size_t i = 0; i < fragments.size(); ++i) {
+    std::vector<std::string> key_value;
+    base::SplitString(fragments[i], '=', &key_value);
+    if (key_value.size() != 2)
+      continue;
+    const std::string& key = key_value[0];
+    const std::string& value = key_value[1];
+
+    if (base::strcasecmp(kPage, key.c_str()) == 0) {
+      // |page_value| is 1-based.
+      int page_value = -1;
+      if (base::StringToInt(value, &page_value) && page_value > 0)
+        page = page_value - 1;
+      continue;
+    }
+    if (base::strcasecmp(kNamedDest, key.c_str()) == 0) {
+      // |page_value| is 0-based.
+      int page_value = engine_->GetNamedDestinationPage(value);
+      if (page_value >= 0)
+        page = page_value;
+      continue;
+    }
+  }
+  return page;
+#endif
+}
+
+void Instance::UpdateToolbarPosition(bool invalidate) {
+  pp::Rect ctrl_rc = toolbar_->GetControlsRect();
+  int min_toolbar_width = ctrl_rc.width() + GetToolbarRightOffset() +
+      GetScaled(kToolbarFadingOffsetLeft);
+  int min_toolbar_height = ctrl_rc.width() + GetToolbarBottomOffset() +
+      GetScaled(kToolbarFadingOffsetBottom);
+
+  // Update toolbar position
+  if (plugin_size_.width() < min_toolbar_width ||
+      plugin_size_.height() < min_toolbar_height) {
+    // Disable toolbar if it does not fit on the screen.
+    toolbar_->Show(false, invalidate);
+  } else {
+    pp::Point offset(
+        plugin_size_.width() - GetToolbarRightOffset() - ctrl_rc.right(),
+        plugin_size_.height() - GetToolbarBottomOffset() - ctrl_rc.bottom());
+    toolbar_->MoveBy(offset, invalidate);
+
+    int toolbar_width = std::max(plugin_size_.width() / 2, min_toolbar_width);
+    toolbar_->ExpandLeft(toolbar_width - toolbar_->rect().width());
+    toolbar_->Show(painted_first_page_, invalidate);
+  }
+}
+
+void Instance::UpdateProgressBarPosition(bool invalidate) {
+  // TODO(gene): verify we don't overlap with toolbar.
+  int scrollbar_thickness = GetScrollbarThickness();
+  pp::Point progress_origin(
+      scrollbar_thickness + GetScaled(kProgressOffsetLeft),
+      plugin_size_.height() - progress_bar_.rect().height() -
+          scrollbar_thickness - GetScaled(kProgressOffsetBottom));
+  progress_bar_.MoveTo(progress_origin, invalidate);
+}
+
+void Instance::UpdatePageIndicatorPosition(bool invalidate) {
+  int32 doc_height = static_cast<int>(document_size_.height() * zoom_);
+  pp::Point origin(
+      plugin_size_.width() - page_indicator_.rect().width() -
+          GetScaled(GetScrollbarReservedThickness()),
+      page_indicator_.GetYPosition(engine_->GetVerticalScrollbarYPosition(),
+                                   doc_height, plugin_size_.height()));
+  page_indicator_.MoveTo(origin, invalidate);
+}
+
+void Instance::SetZoom(ZoomMode zoom_mode, double scale) {
+  double old_zoom = zoom_;
+
+  zoom_mode_ = zoom_mode;
+  if (zoom_mode_ == ZOOM_SCALE)
+    zoom_ = scale;
+  UpdateZoomScale();
+
+  engine_->ZoomUpdated(zoom_ * device_scale_);
+  OnGeometryChanged(old_zoom, device_scale_);
+
+  // If fit-to-height, snap to the beginning of the most visible page.
+  if (zoom_mode_ == ZOOM_FIT_TO_PAGE) {
+    ScrollToPage(engine_->GetMostVisiblePage());
+  }
+
+  // Update sticky buttons to the current zoom style.
+  Button* ftp_btn = static_cast<Button*>(
+      toolbar_->GetControl(kFitToPageButtonId));
+  Button* ftw_btn = static_cast<Button*>(
+      toolbar_->GetControl(kFitToWidthButtonId));
+  switch (zoom_mode_) {
+    case ZOOM_FIT_TO_PAGE:
+      ftp_btn->SetPressedState(true);
+      ftw_btn->SetPressedState(false);
+      break;
+    case ZOOM_FIT_TO_WIDTH:
+      ftw_btn->SetPressedState(true);
+      ftp_btn->SetPressedState(false);
+      break;
+    default:
+      ftw_btn->SetPressedState(false);
+      ftp_btn->SetPressedState(false);
+  }
+}
+
+void Instance::UpdateZoomScale() {
+  switch (zoom_mode_) {
+    case ZOOM_SCALE:
+      break;  // Keep current scale.
+    case ZOOM_FIT_TO_PAGE: {
+      int page_num = engine_->GetFirstVisiblePage();
+      if (page_num == -1)
+        break;
+      pp::Rect rc = engine_->GetPageRect(page_num);
+      if (!rc.height())
+        break;
+      // Calculate fit to width zoom level.
+      double ftw_zoom = static_cast<double>(plugin_dip_size_.width() -
+          GetScrollbarReservedThickness()) / document_size_.width();
+      // Calculate fit to height zoom level. If document will not fit
+      // horizontally, adjust zoom level to allow space for horizontal
+      // scrollbar.
+      double fth_zoom =
+          static_cast<double>(plugin_dip_size_.height()) / rc.height();
+      if (fth_zoom * document_size_.width() >
+          plugin_dip_size_.width() - GetScrollbarReservedThickness())
+        fth_zoom = static_cast<double>(plugin_dip_size_.height()
+            - GetScrollbarReservedThickness()) / rc.height();
+      zoom_ = std::min(ftw_zoom, fth_zoom);
+    } break;
+    case ZOOM_FIT_TO_WIDTH:
+    case ZOOM_AUTO:
+      if (!document_size_.width())
+        break;
+      zoom_ = static_cast<double>(plugin_dip_size_.width() -
+          GetScrollbarReservedThickness()) / document_size_.width();
+      if (zoom_mode_ == ZOOM_AUTO && zoom_ > 1.0)
+        zoom_ = 1.0;
+      break;
+  }
+  zoom_ = ClipToRange(zoom_, kMinZoom, kMaxZoom);
+}
+
+double Instance::CalculateZoom(uint32 control_id) const {
+  if (control_id == kZoomInButtonId) {
+    for (size_t i = 0; i < chrome_page_zoom::kPresetZoomFactorsSize; ++i) {
+      double current_zoom = chrome_page_zoom::kPresetZoomFactors[i];
+      if (current_zoom - content::kEpsilon > zoom_)
+        return current_zoom;
+    }
+  } else {
+    for (size_t i = chrome_page_zoom::kPresetZoomFactorsSize; i > 0; --i) {
+      double current_zoom = chrome_page_zoom::kPresetZoomFactors[i - 1];
+      if (current_zoom + content::kEpsilon < zoom_)
+        return current_zoom;
+    }
+  }
+  return zoom_;
+}
+
+pp::ImageData Instance::CreateResourceImage(PP_ResourceImage image_id) {
+  if (hidpi_enabled_)
+    return pp::PDF::GetResourceImageForScale(this, image_id, device_scale_);
+
+  return pp::PDF::GetResourceImage(this, image_id);
+}
+
+std::string Instance::GetLocalizedString(PP_ResourceString id) {
+  pp::Var rv(pp::PDF::GetLocalizedString(this, id));
+  if (!rv.is_string())
+    return std::string();
+
+  return rv.AsString();
+}
+
+void Instance::DrawText(const pp::Point& top_center, PP_ResourceString id) {
+  std::string str(GetLocalizedString(id));
+
+  pp::FontDescription_Dev description;
+  description.set_family(PP_FONTFAMILY_SANSSERIF);
+  description.set_size(kMessageTextSize * device_scale_);
+  pp::Font_Dev font(this, description);
+  int length = font.MeasureSimpleText(str);
+  pp::Point point(top_center);
+  point.set_x(point.x() - length / 2);
+  DCHECK(!image_data_.is_null());
+  font.DrawSimpleText(&image_data_, str, point, kMessageTextColor);
+}
+
+void Instance::SetPrintPreviewMode(int page_count) {
+  if (!IsPrintPreview() || page_count <= 0) {
+    print_preview_page_count_ = 0;
+    return;
+  }
+
+  print_preview_page_count_ = page_count;
+  ScrollToPage(0);
+  engine_->AppendBlankPages(print_preview_page_count_);
+  if (preview_pages_info_.size() > 0)
+    LoadAvailablePreviewPage();
+}
+
+bool Instance::IsPrintPreview() {
+  return IsPrintPreviewUrl(url_);
+}
+
+int Instance::GetPageNumberToDisplay() {
+  int page = engine_->GetMostVisiblePage();
+  if (IsPrintPreview() && !print_preview_page_numbers_.empty()) {
+    page = ClipToRange<int>(page, 0, print_preview_page_numbers_.size() - 1);
+    return print_preview_page_numbers_[page];
+  }
+  return page + 1;
+}
+
+void Instance::ProcessPreviewPageInfo(const std::string& url,
+                                      int dst_page_index) {
+  if (!IsPrintPreview() || print_preview_page_count_ < 0)
+    return;
+
+  int src_page_index = ExtractPrintPreviewPageIndex(url);
+  if (src_page_index < 1)
+    return;
+
+  preview_pages_info_.push(std::make_pair(url, dst_page_index));
+  LoadAvailablePreviewPage();
+}
+
+void Instance::LoadAvailablePreviewPage() {
+  if (preview_pages_info_.size() <= 0)
+    return;
+
+  std::string url = preview_pages_info_.front().first;
+  int dst_page_index = preview_pages_info_.front().second;
+  int src_page_index = ExtractPrintPreviewPageIndex(url);
+  if (src_page_index < 1 ||
+      dst_page_index >= print_preview_page_count_ ||
+      preview_document_load_state_ == LOAD_STATE_LOADING) {
+    return;
+  }
+
+  preview_document_load_state_ = LOAD_STATE_LOADING;
+  LoadPreviewUrl(url);
+}
+
+void Instance::EnableAutoscroll(const pp::Point& origin) {
+  if (is_autoscroll_)
+    return;
+
+  pp::Size client_size = plugin_size_;
+  if (v_scrollbar_.get())
+    client_size.Enlarge(-GetScrollbarThickness(), 0);
+  if (h_scrollbar_.get())
+    client_size.Enlarge(0, -GetScrollbarThickness());
+
+  // Do not allow autoscroll if client area is too small.
+  if (autoscroll_anchor_.size().width() > client_size.width() ||
+      autoscroll_anchor_.size().height() > client_size.height())
+    return;
+
+  autoscroll_rect_ = pp::Rect(
+      pp::Point(origin.x() - autoscroll_anchor_.size().width() / 2,
+                origin.y() - autoscroll_anchor_.size().height() / 2),
+      autoscroll_anchor_.size());
+
+  // Make sure autoscroll anchor is in the client area.
+  if (autoscroll_rect_.right() > client_size.width()) {
+    autoscroll_rect_.set_x(
+        client_size.width() - autoscroll_anchor_.size().width());
+  }
+  if (autoscroll_rect_.bottom() > client_size.height()) {
+    autoscroll_rect_.set_y(
+        client_size.height() - autoscroll_anchor_.size().height());
+  }
+
+  if (autoscroll_rect_.x() < 0)
+    autoscroll_rect_.set_x(0);
+  if (autoscroll_rect_.y() < 0)
+    autoscroll_rect_.set_y(0);
+
+  is_autoscroll_ = true;
+  Invalidate(kAutoScrollId, autoscroll_rect_);
+
+  ScheduleTimer(kAutoScrollId, kAutoScrollTimeoutMs);
+}
+
+void Instance::DisableAutoscroll() {
+  if (is_autoscroll_) {
+    is_autoscroll_ = false;
+    Invalidate(kAutoScrollId, autoscroll_rect_);
+  }
+}
+
+PP_CursorType_Dev Instance::CalculateAutoscroll(const pp::Point& mouse_pos) {
+  // Scroll only if mouse pointer is outside of the anchor area.
+  if (autoscroll_rect_.Contains(mouse_pos)) {
+    autoscroll_x_ = 0;
+    autoscroll_y_ = 0;
+    return PP_CURSORTYPE_MIDDLEPANNING;
+  }
+
+  // Relative position to the center of anchor area.
+  pp::Point rel_pos = mouse_pos - autoscroll_rect_.CenterPoint();
+
+  // Calculate angle from the X axis. Angle is in range from -pi to pi.
+  double angle = atan2(static_cast<double>(rel_pos.y()),
+                       static_cast<double>(rel_pos.x()));
+
+  autoscroll_x_ = rel_pos.x() * kAutoScrollFactor;
+  autoscroll_y_ = rel_pos.y() * kAutoScrollFactor;
+
+  // Angle is from -pi to pi. Screen Y is increasing toward bottom,
+  // so negative angle represent north direction.
+  if (angle < - (M_PI * 7.0 / 8.0)) {
+    // going west
+    return PP_CURSORTYPE_WESTPANNING;
+  } else if (angle < - (M_PI * 5.0 / 8.0)) {
+    // going north-west
+    return PP_CURSORTYPE_NORTHWESTPANNING;
+  } else if (angle < - (M_PI * 3.0 / 8.0)) {
+    // going north.
+    return PP_CURSORTYPE_NORTHPANNING;
+  } else if (angle < - (M_PI * 1.0 / 8.0)) {
+    // going north-east
+    return PP_CURSORTYPE_NORTHEASTPANNING;
+  } else if (angle < M_PI * 1.0 / 8.0) {
+    // going east.
+    return PP_CURSORTYPE_EASTPANNING;
+  } else if (angle < M_PI * 3.0 / 8.0) {
+    // going south-east
+    return PP_CURSORTYPE_SOUTHEASTPANNING;
+  } else if (angle < M_PI * 5.0 / 8.0) {
+    // going south.
+    return PP_CURSORTYPE_SOUTHPANNING;
+  } else if (angle < M_PI * 7.0 / 8.0) {
+    // going south-west
+    return PP_CURSORTYPE_SOUTHWESTPANNING;
+  }
+
+  // went around the circle, going west again
+  return PP_CURSORTYPE_WESTPANNING;
+}
+
+void Instance::ConfigureNumberImageGenerator() {
+  std::vector<pp::ImageData> num_images = GetThumbnailResources();
+  pp::ImageData number_background = CreateResourceImage(
+      PP_RESOURCEIMAGE_PDF_BUTTON_THUMBNAIL_NUM_BACKGROUND);
+  number_image_generator_->Configure(number_background,
+                                     num_images,
+                                     device_scale_);
+}
+
+NumberImageGenerator* Instance::number_image_generator() {
+  if (!number_image_generator_.get()) {
+    number_image_generator_.reset(new NumberImageGenerator(this));
+    ConfigureNumberImageGenerator();
+  }
+  return number_image_generator_.get();
+}
+
+int Instance::GetScaled(int x) const {
+  return static_cast<int>(x * device_scale_);
+}
+
+void Instance::UserMetricsRecordAction(const std::string& action) {
+  pp::PDF::UserMetricsRecordAction(this, pp::Var(action));
+}
+
+PDFScriptableObject::PDFScriptableObject(Instance* instance)
+    : instance_(instance) {
+}
+
+PDFScriptableObject::~PDFScriptableObject() {
+}
+
+bool PDFScriptableObject::HasMethod(const pp::Var& name, pp::Var* exception) {
+  return instance_->HasScriptableMethod(name, exception);
+}
+
+pp::Var PDFScriptableObject::Call(const pp::Var& method,
+                                  const std::vector<pp::Var>& args,
+                                  pp::Var* exception) {
+  return instance_->CallScriptableMethod(method, args, exception);
+}
+
+}  // namespace chrome_pdf