Refactor webview to use //components/printing

android_webview/renderer/print_web_view_helper.cc

-// Copyright 2013 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.
-
-// TODO(sgurun) copied from chrome/renderer. Remove after crbug.com/322276
-
-#include "android_webview/renderer/print_web_view_helper.h"
-
-#include <string>
-
-#include "android_webview/common/print_messages.h"
-#include "base/auto_reset.h"
-#include "base/command_line.h"
-#include "base/json/json_writer.h"
-#include "base/logging.h"
-#include "base/message_loop/message_loop.h"
-#include "base/metrics/histogram.h"
-#include "base/process/process_handle.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/stringprintf.h"
-#include "base/strings/utf_string_conversions.h"
-#include "content/public/common/web_preferences.h"
-#include "content/public/renderer/render_thread.h"
-#include "content/public/renderer/render_view.h"
-#include "net/base/escape.h"
-#include "printing/pdf_metafile_skia.h"
-#include "printing/units.h"
-#include "third_party/WebKit/public/platform/WebSize.h"
-#include "third_party/WebKit/public/platform/WebURLRequest.h"
-#include "third_party/WebKit/public/web/WebConsoleMessage.h"
-#include "third_party/WebKit/public/web/WebDocument.h"
-#include "third_party/WebKit/public/web/WebElement.h"
-#include "third_party/WebKit/public/web/WebFrameClient.h"
-#include "third_party/WebKit/public/web/WebLocalFrame.h"
-#include "third_party/WebKit/public/web/WebPlugin.h"
-#include "third_party/WebKit/public/web/WebPluginDocument.h"
-#include "third_party/WebKit/public/web/WebPrintParams.h"
-#include "third_party/WebKit/public/web/WebPrintScalingOption.h"
-#include "third_party/WebKit/public/web/WebSandboxFlags.h"
-#include "third_party/WebKit/public/web/WebScriptSource.h"
-#include "third_party/WebKit/public/web/WebSettings.h"
-#include "third_party/WebKit/public/web/WebView.h"
-#include "third_party/WebKit/public/web/WebViewClient.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/resource/resource_bundle.h"
-
-// This code is copied from chrome/renderer/printing. Code is slightly
-// modified to run it with webview, and the modifications are marked
-// using OS_ANDROID.
-// TODO(sgurun): remove the code as part of componentization of printing.
-
-using content::WebPreferences;
-
-namespace printing {
-
-namespace {
-
-enum PrintPreviewHelperEvents {
-  PREVIEW_EVENT_REQUESTED,
-  PREVIEW_EVENT_CACHE_HIT,  // Unused
-  PREVIEW_EVENT_CREATE_DOCUMENT,
-  PREVIEW_EVENT_NEW_SETTINGS,  // Unused
-  PREVIEW_EVENT_MAX,
-};
-
-const double kMinDpi = 1.0;
-
-#if 0
-// TODO(sgurun) android_webview hack
-const char kPageLoadScriptFormat[] =
-    "document.open(); document.write(%s); document.close();";
-
-const char kPageSetupScriptFormat[] = "setup(%s);";
-
-void ExecuteScript(blink::WebFrame* frame,
-                   const char* script_format,
-                   const base::Value& parameters) {
-  std::string json;
-  base::JSONWriter::Write(&parameters, &json);
-  std::string script = base::StringPrintf(script_format, json.c_str());
-  frame->executeScript(blink::WebString(base::UTF8ToUTF16(script)));
-}
-#endif
-
-int GetDPI(const PrintMsg_Print_Params* print_params) {
-#if defined(OS_MACOSX)
-  // On the Mac, the printable area is in points, don't do any scaling based
-  // on dpi.
-  return kPointsPerInch;
-#else
-  return static_cast<int>(print_params->dpi);
-#endif  // defined(OS_MACOSX)
-}
-
-bool PrintMsg_Print_Params_IsValid(const PrintMsg_Print_Params& params) {
-  return !params.content_size.IsEmpty() && !params.page_size.IsEmpty() &&
-         !params.printable_area.IsEmpty() && params.document_cookie &&
-         params.desired_dpi && params.max_shrink && params.min_shrink &&
-         params.dpi && (params.margin_top >= 0) && (params.margin_left >= 0);
-}
-
-PrintMsg_Print_Params GetCssPrintParams(
-    blink::WebFrame* frame,
-    int page_index,
-    const PrintMsg_Print_Params& page_params) {
-  PrintMsg_Print_Params page_css_params = page_params;
-  int dpi = GetDPI(&page_params);
-
-  blink::WebSize page_size_in_pixels(
-      ConvertUnit(page_params.page_size.width(), dpi, kPixelsPerInch),
-      ConvertUnit(page_params.page_size.height(), dpi, kPixelsPerInch));
-  int margin_top_in_pixels =
-      ConvertUnit(page_params.margin_top, dpi, kPixelsPerInch);
-  int margin_right_in_pixels = ConvertUnit(
-      page_params.page_size.width() -
-      page_params.content_size.width() - page_params.margin_left,
-      dpi, kPixelsPerInch);
-  int margin_bottom_in_pixels = ConvertUnit(
-      page_params.page_size.height() -
-      page_params.content_size.height() - page_params.margin_top,
-      dpi, kPixelsPerInch);
-  int margin_left_in_pixels = ConvertUnit(
-      page_params.margin_left,
-      dpi, kPixelsPerInch);
-
-  blink::WebSize original_page_size_in_pixels = page_size_in_pixels;
-
-  if (frame) {
-    frame->pageSizeAndMarginsInPixels(page_index,
-                                      page_size_in_pixels,
-                                      margin_top_in_pixels,
-                                      margin_right_in_pixels,
-                                      margin_bottom_in_pixels,
-                                      margin_left_in_pixels);
-  }
-
-  int new_content_width = page_size_in_pixels.width -
-                          margin_left_in_pixels - margin_right_in_pixels;
-  int new_content_height = page_size_in_pixels.height -
-                           margin_top_in_pixels - margin_bottom_in_pixels;
-
-  // Invalid page size and/or margins. We just use the default setting.
-  if (new_content_width < 1 || new_content_height < 1) {
-    CHECK(frame);
-    page_css_params = GetCssPrintParams(NULL, page_index, page_params);
-    return page_css_params;
-  }
-
-  page_css_params.content_size = gfx::Size(
-      ConvertUnit(new_content_width, kPixelsPerInch, dpi),
-      ConvertUnit(new_content_height, kPixelsPerInch, dpi));
-
-  if (original_page_size_in_pixels != page_size_in_pixels) {
-    page_css_params.page_size = gfx::Size(
-        ConvertUnit(page_size_in_pixels.width, kPixelsPerInch, dpi),
-        ConvertUnit(page_size_in_pixels.height, kPixelsPerInch, dpi));
-  } else {
-    // Printing frame doesn't have any page size css. Pixels to dpi conversion
-    // causes rounding off errors. Therefore use the default page size values
-    // directly.
-    page_css_params.page_size = page_params.page_size;
-  }
-
-  page_css_params.margin_top =
-      ConvertUnit(margin_top_in_pixels, kPixelsPerInch, dpi);
-  page_css_params.margin_left =
-      ConvertUnit(margin_left_in_pixels, kPixelsPerInch, dpi);
-  return page_css_params;
-}
-
-double FitPrintParamsToPage(const PrintMsg_Print_Params& page_params,
-                            PrintMsg_Print_Params* params_to_fit) {
-  double content_width =
-      static_cast<double>(params_to_fit->content_size.width());
-  double content_height =
-      static_cast<double>(params_to_fit->content_size.height());
-  int default_page_size_height = page_params.page_size.height();
-  int default_page_size_width = page_params.page_size.width();
-  int css_page_size_height = params_to_fit->page_size.height();
-  int css_page_size_width = params_to_fit->page_size.width();
-
-  double scale_factor = 1.0f;
-  if (page_params.page_size == params_to_fit->page_size)
-    return scale_factor;
-
-  if (default_page_size_width < css_page_size_width ||
-      default_page_size_height < css_page_size_height) {
-    double ratio_width =
-        static_cast<double>(default_page_size_width) / css_page_size_width;
-    double ratio_height =
-        static_cast<double>(default_page_size_height) / css_page_size_height;
-    scale_factor = ratio_width < ratio_height ? ratio_width : ratio_height;
-    content_width *= scale_factor;
-    content_height *= scale_factor;
-  }
-  params_to_fit->margin_top = static_cast<int>(
-      (default_page_size_height - css_page_size_height * scale_factor) / 2 +
-      (params_to_fit->margin_top * scale_factor));
-  params_to_fit->margin_left = static_cast<int>(
-      (default_page_size_width - css_page_size_width * scale_factor) / 2 +
-      (params_to_fit->margin_left * scale_factor));
-  params_to_fit->content_size = gfx::Size(
-      static_cast<int>(content_width), static_cast<int>(content_height));
-  params_to_fit->page_size = page_params.page_size;
-  return scale_factor;
-}
-
-void CalculatePageLayoutFromPrintParams(
-    const PrintMsg_Print_Params& params,
-    PageSizeMargins* page_layout_in_points) {
-  int dpi = GetDPI(&params);
-  int content_width = params.content_size.width();
-  int content_height = params.content_size.height();
-
-  int margin_bottom = params.page_size.height() -
-                      content_height - params.margin_top;
-  int margin_right = params.page_size.width() -
-                      content_width - params.margin_left;
-
-  page_layout_in_points->content_width =
-      ConvertUnit(content_width, dpi, kPointsPerInch);
-  page_layout_in_points->content_height =
-      ConvertUnit(content_height, dpi, kPointsPerInch);
-  page_layout_in_points->margin_top =
-      ConvertUnit(params.margin_top, dpi, kPointsPerInch);
-  page_layout_in_points->margin_right =
-      ConvertUnit(margin_right, dpi, kPointsPerInch);
-  page_layout_in_points->margin_bottom =
-      ConvertUnit(margin_bottom, dpi, kPointsPerInch);
-  page_layout_in_points->margin_left =
-      ConvertUnit(params.margin_left, dpi, kPointsPerInch);
-}
-
-void EnsureOrientationMatches(const PrintMsg_Print_Params& css_params,
-                              PrintMsg_Print_Params* page_params) {
-  if ((page_params->page_size.width() > page_params->page_size.height()) ==
-      (css_params.page_size.width() > css_params.page_size.height())) {
-    return;
-  }
-
-  // Swap the |width| and |height| values.
-  page_params->page_size.SetSize(page_params->page_size.height(),
-                                 page_params->page_size.width());
-  page_params->content_size.SetSize(page_params->content_size.height(),
-                                    page_params->content_size.width());
-  page_params->printable_area.set_size(
-      gfx::Size(page_params->printable_area.height(),
-                page_params->printable_area.width()));
-}
-
-void ComputeWebKitPrintParamsInDesiredDpi(
-    const PrintMsg_Print_Params& print_params,
-    blink::WebPrintParams* webkit_print_params) {
-  int dpi = GetDPI(&print_params);
-  webkit_print_params->printerDPI = dpi;
-  webkit_print_params->printScalingOption = print_params.print_scaling_option;
-
-  webkit_print_params->printContentArea.width =
-      ConvertUnit(print_params.content_size.width(), dpi,
-                  print_params.desired_dpi);
-  webkit_print_params->printContentArea.height =
-      ConvertUnit(print_params.content_size.height(), dpi,
-                  print_params.desired_dpi);
-
-  webkit_print_params->printableArea.x =
-      ConvertUnit(print_params.printable_area.x(), dpi,
-                  print_params.desired_dpi);
-  webkit_print_params->printableArea.y =
-      ConvertUnit(print_params.printable_area.y(), dpi,
-                  print_params.desired_dpi);
-  webkit_print_params->printableArea.width =
-      ConvertUnit(print_params.printable_area.width(), dpi,
-                  print_params.desired_dpi);
-  webkit_print_params->printableArea.height =
-      ConvertUnit(print_params.printable_area.height(),
-                  dpi, print_params.desired_dpi);
-
-  webkit_print_params->paperSize.width =
-      ConvertUnit(print_params.page_size.width(), dpi,
-                  print_params.desired_dpi);
-  webkit_print_params->paperSize.height =
-      ConvertUnit(print_params.page_size.height(), dpi,
-                  print_params.desired_dpi);
-}
-
-blink::WebPlugin* GetPlugin(const blink::WebFrame* frame) {
-  return frame->document().isPluginDocument() ?
-         frame->document().to<blink::WebPluginDocument>().plugin() : NULL;
-}
-
-bool PrintingNodeOrPdfFrame(const blink::WebFrame* frame,
-                            const blink::WebNode& node) {
-  if (!node.isNull())
-    return true;
-  blink::WebPlugin* plugin = GetPlugin(frame);
-  return plugin && plugin->supportsPaginatedPrint();
-}
-
-bool PrintingFrameHasPageSizeStyle(blink::WebFrame* frame,
-                                   int total_page_count) {
-  if (!frame)
-    return false;
-  bool frame_has_custom_page_size_style = false;
-  for (int i = 0; i < total_page_count; ++i) {
-    if (frame->hasCustomPageSizeStyle(i)) {
-      frame_has_custom_page_size_style = true;
-      break;
-    }
-  }
-  return frame_has_custom_page_size_style;
-}
-
-MarginType GetMarginsForPdf(blink::WebFrame* frame,
-                            const blink::WebNode& node) {
-  if (frame->isPrintScalingDisabledForPlugin(node))
-    return NO_MARGINS;
-  else
-    return PRINTABLE_AREA_MARGINS;
-}
-
-bool FitToPageEnabled(const base::DictionaryValue& job_settings) {
-  bool fit_to_paper_size = false;
-  if (!job_settings.GetBoolean(kSettingFitToPageEnabled, &fit_to_paper_size)) {
-    NOTREACHED();
-  }
-  return fit_to_paper_size;
-}
-
-PrintMsg_Print_Params CalculatePrintParamsForCss(
-    blink::WebFrame* frame,
-    int page_index,
-    const PrintMsg_Print_Params& page_params,
-    bool ignore_css_margins,
-    bool fit_to_page,
-    double* scale_factor) {
-  PrintMsg_Print_Params css_params = GetCssPrintParams(frame, page_index,
-                                                       page_params);
-
-  PrintMsg_Print_Params params = page_params;
-  EnsureOrientationMatches(css_params, &params);
-
-  if (ignore_css_margins && fit_to_page)
-    return params;
-
-  PrintMsg_Print_Params result_params = css_params;
-  if (ignore_css_margins) {
-    result_params.margin_top = params.margin_top;
-    result_params.margin_left = params.margin_left;
-
-    DCHECK(!fit_to_page);
-    // Since we are ignoring the margins, the css page size is no longer
-    // valid.
-    int default_margin_right = params.page_size.width() -
-        params.content_size.width() - params.margin_left;
-    int default_margin_bottom = params.page_size.height() -
-        params.content_size.height() - params.margin_top;
-    result_params.content_size = gfx::Size(
-        result_params.page_size.width() - result_params.margin_left -
-            default_margin_right,
-        result_params.page_size.height() - result_params.margin_top -
-            default_margin_bottom);
-  }
-
-  if (fit_to_page) {
-    double factor = FitPrintParamsToPage(params, &result_params);
-    if (scale_factor)
-      *scale_factor = factor;
-  }
-  return result_params;
-}
-
-bool IsPrintPreviewEnabled() {
-  return false;
-}
-
-bool IsPrintThrottlingDisabled() {
-  return true;
-}
-
-}  // namespace
-
-FrameReference::FrameReference(blink::WebLocalFrame* frame) {
-  Reset(frame);
-}
-
-FrameReference::FrameReference() {
-  Reset(NULL);
-}
-
-FrameReference::~FrameReference() {
-}
-
-void FrameReference::Reset(blink::WebLocalFrame* frame) {
-  if (frame) {
-    view_ = frame->view();
-    frame_ = frame;
-  } else {
-    view_ = NULL;
-    frame_ = NULL;
-  }
-}
-
-blink::WebLocalFrame* FrameReference::GetFrame() {
-  if (view_ == NULL || frame_ == NULL)
-    return NULL;
-  for (blink::WebFrame* frame = view_->mainFrame(); frame != NULL;
-           frame = frame->traverseNext(false)) {
-    if (frame == frame_)
-      return frame_;
-  }
-  return NULL;
-}
-
-blink::WebView* FrameReference::view() {
-  return view_;
-}
-
-// static - Not anonymous so that platform implementations can use it.
-void PrintWebViewHelper::PrintHeaderAndFooter(
-    blink::WebCanvas* canvas,
-    int page_number,
-    int total_pages,
-    float webkit_scale_factor,
-    const PageSizeMargins& page_layout,
-    const base::DictionaryValue& header_footer_info,
-    const PrintMsg_Print_Params& params) {
-#if 0
-  // TODO(sgurun) android_webview hack
-  SkAutoCanvasRestore auto_restore(canvas, true);
-  canvas->scale(1 / webkit_scale_factor, 1 / webkit_scale_factor);
-
-  blink::WebSize page_size(page_layout.margin_left + page_layout.margin_right +
-                            page_layout.content_width,
-                            page_layout.margin_top + page_layout.margin_bottom +
-                            page_layout.content_height);
-
-  blink::WebView* web_view = blink::WebView::create(NULL);
-  web_view->settings()->setJavaScriptEnabled(true);
-  blink::WebFrame* frame = blink::WebLocalFrame::create(NULL)
-  web_view->setMainFrame(web_frame);
-
-  base::StringValue html(
-      ResourceBundle::GetSharedInstance().GetLocalizedString(
-          IDR_PRINT_PREVIEW_PAGE));
-  // Load page with script to avoid async operations.
-  ExecuteScript(frame, kPageLoadScriptFormat, html);
-
-  scoped_ptr<base::DictionaryValue> options(header_footer_info.DeepCopy());
-  options->SetDouble("width", page_size.width);
-  options->SetDouble("height", page_size.height);
-  options->SetDouble("topMargin", page_layout.margin_top);
-  options->SetDouble("bottomMargin", page_layout.margin_bottom);
-  options->SetString("pageNumber",
-                     base::StringPrintf("%d/%d", page_number, total_pages));
-
-  ExecuteScript(frame, kPageSetupScriptFormat, *options);
-
-  blink::WebPrintParams webkit_params(page_size);
-  webkit_params.printerDPI = GetDPI(&params);
-
-  frame->printBegin(webkit_params, WebKit::WebNode(), NULL);
-  frame->printPage(0, canvas);
-  frame->printEnd();
-
-  web_view->close();
-  frame->close();
-#endif
-}
-
-// static - Not anonymous so that platform implementations can use it.
-float PrintWebViewHelper::RenderPageContent(blink::WebFrame* frame,
-                                            int page_number,
-                                            const gfx::Rect& canvas_area,
-                                            const gfx::Rect& content_area,
-                                            double scale_factor,
-                                            blink::WebCanvas* canvas) {
-  SkAutoCanvasRestore auto_restore(canvas, true);
-  if (content_area != canvas_area) {
-    canvas->translate((content_area.x() - canvas_area.x()) / scale_factor,
-                      (content_area.y() - canvas_area.y()) / scale_factor);
-    SkRect clip_rect(
-        SkRect::MakeXYWH(content_area.origin().x() / scale_factor,
-                         content_area.origin().y() / scale_factor,
-                         content_area.size().width() / scale_factor,
-                         content_area.size().height() / scale_factor));
-    SkIRect clip_int_rect;
-    clip_rect.roundOut(&clip_int_rect);
-    SkRegion clip_region(clip_int_rect);
-    canvas->setClipRegion(clip_region);
-  }
-  return frame->printPage(page_number, canvas);
-}
-
-// Class that calls the Begin and End print functions on the frame and changes
-// the size of the view temporarily to support full page printing..
-class PrepareFrameAndViewForPrint : public blink::WebViewClient,
-                                    public blink::WebFrameClient {
- public:
-  PrepareFrameAndViewForPrint(const PrintMsg_Print_Params& params,
-                              blink::WebLocalFrame* frame,
-                              const blink::WebNode& node,
-                              bool ignore_css_margins);
-  virtual ~PrepareFrameAndViewForPrint();
-
-  // Optional. Replaces |frame_| with selection if needed. Will call |on_ready|
-  // when completed.
-  void CopySelectionIfNeeded(const WebPreferences& preferences,
-                             const base::Closure& on_ready);
-
-  // Prepares frame for printing.
-  void StartPrinting();
-
-  blink::WebLocalFrame* frame() {
-    return frame_.GetFrame();
-  }
-
-  const blink::WebNode& node() const {
-    return node_to_print_;
-  }
-
-  int GetExpectedPageCount() const {
-    return expected_pages_count_;
-  }
-
-  gfx::Size GetPrintCanvasSize() const;
-
-  void FinishPrinting();
-
-  bool IsLoadingSelection() {
-    // It's not selection if not |owns_web_view_|.
-    return owns_web_view_ && frame() && frame()->isLoading();
-  }
-
-  // TODO(ojan): Remove this override and have this class use a non-null
-  // layerTreeView.
-  // blink::WebViewClient override:
-  virtual bool allowsBrokenNullLayerTreeView() const;
-
- protected:
-  // blink::WebViewClient override:
-  virtual void didStopLoading();
-
-  // blink::WebFrameClient override:
-  virtual blink::WebFrame* createChildFrame(
-      blink::WebLocalFrame* parent,
-      const blink::WebString& name,
-      blink::WebSandboxFlags sandboxFlags);
-  virtual void frameDetached(blink::WebFrame* frame);
-
- private:
-  void CallOnReady();
-  void ResizeForPrinting();
-  void RestoreSize();
-  void CopySelection(const WebPreferences& preferences);
-
-  FrameReference frame_;
-  blink::WebNode node_to_print_;
-  bool owns_web_view_;
-  blink::WebPrintParams web_print_params_;
-  gfx::Size prev_view_size_;
-  gfx::Size prev_scroll_offset_;
-  int expected_pages_count_;
-  base::Closure on_ready_;
-  bool should_print_backgrounds_;
-  bool should_print_selection_only_;
-  bool is_printing_started_;
-
-  base::WeakPtrFactory<PrepareFrameAndViewForPrint> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
-};
-
-PrepareFrameAndViewForPrint::PrepareFrameAndViewForPrint(
-    const PrintMsg_Print_Params& params,
-    blink::WebLocalFrame* frame,
-    const blink::WebNode& node,
-    bool ignore_css_margins)
-    : frame_(frame),
-      node_to_print_(node),
-      owns_web_view_(false),
-      expected_pages_count_(0),
-      should_print_backgrounds_(params.should_print_backgrounds),
-      should_print_selection_only_(params.selection_only),
-      is_printing_started_(false),
-      weak_ptr_factory_(this) {
-  PrintMsg_Print_Params print_params = params;
-  if (!should_print_selection_only_ ||
-      !PrintingNodeOrPdfFrame(frame, node_to_print_)) {
-    bool fit_to_page = ignore_css_margins &&
-                       print_params.print_scaling_option ==
-                            blink::WebPrintScalingOptionFitToPrintableArea;
-    ComputeWebKitPrintParamsInDesiredDpi(params, &web_print_params_);
-    frame->printBegin(web_print_params_, node_to_print_);
-    print_params = CalculatePrintParamsForCss(frame, 0, print_params,
-                                              ignore_css_margins, fit_to_page,
-                                              NULL);
-    frame->printEnd();
-  }
-  ComputeWebKitPrintParamsInDesiredDpi(print_params, &web_print_params_);
-}
-
-PrepareFrameAndViewForPrint::~PrepareFrameAndViewForPrint() {
-  FinishPrinting();
-}
-
-void PrepareFrameAndViewForPrint::ResizeForPrinting() {
-  // Layout page according to printer page size. Since WebKit shrinks the
-  // size of the page automatically (from 125% to 200%) we trick it to
-  // think the page is 125% larger so the size of the page is correct for
-  // minimum (default) scaling.
-  // This is important for sites that try to fill the page.
-  gfx::Size print_layout_size(web_print_params_.printContentArea.width,
-                              web_print_params_.printContentArea.height);
-  print_layout_size.set_height(
-      static_cast<int>(static_cast<double>(print_layout_size.height()) * 1.25));
-
-  if (!frame())
-    return;
-  blink::WebView* web_view = frame_.view();
-  // Backup size and offset.
-  if (blink::WebFrame* web_frame = web_view->mainFrame())
-    prev_scroll_offset_ = web_frame->scrollOffset();
-  prev_view_size_ = web_view->size();
-
-  web_view->resize(print_layout_size);
-}
-
-
-void PrepareFrameAndViewForPrint::StartPrinting() {
-  ResizeForPrinting();
-  blink::WebView* web_view = frame_.view();
-  web_view->settings()->setShouldPrintBackgrounds(should_print_backgrounds_);
-  expected_pages_count_ =
-      frame()->printBegin(web_print_params_, node_to_print_);
-  is_printing_started_ = true;
-}
-
-void PrepareFrameAndViewForPrint::CopySelectionIfNeeded(
-    const WebPreferences& preferences,
-    const base::Closure& on_ready) {
-  on_ready_ = on_ready;
-  if (should_print_selection_only_)
-    CopySelection(preferences);
-  else
-    didStopLoading();
-}
-
-void PrepareFrameAndViewForPrint::CopySelection(
-    const WebPreferences& preferences) {
-  ResizeForPrinting();
-  std::string url_str = "data:text/html;charset=utf-8,";
-  url_str.append(
-      net::EscapeQueryParamValue(frame()->selectionAsMarkup().utf8(), false));
-  RestoreSize();
-  // Create a new WebView with the same settings as the current display one.
-  // Except that we disable javascript (don't want any active content running
-  // on the page).
-  WebPreferences prefs = preferences;
-  prefs.javascript_enabled = false;
-  prefs.java_enabled = false;
-
-  blink::WebView* web_view = blink::WebView::create(this);
-  owns_web_view_ = true;
-  content::RenderView::ApplyWebPreferences(prefs, web_view);
-  web_view->setMainFrame(blink::WebLocalFrame::create(this));
-  frame_.Reset(web_view->mainFrame()->toWebLocalFrame());
-  node_to_print_.reset();
-
-  // When loading is done this will call didStopLoading() and that will do the
-  // actual printing.
-  frame()->loadRequest(blink::WebURLRequest(GURL(url_str)));
-}
-
-bool PrepareFrameAndViewForPrint::allowsBrokenNullLayerTreeView() const {
-  return true;
-}
-
-void PrepareFrameAndViewForPrint::didStopLoading() {
-  DCHECK(!on_ready_.is_null());
-  // Don't call callback here, because it can delete |this| and WebView that is
-  // called didStopLoading.
-  base::MessageLoop::current()->PostTask(
-      FROM_HERE,
-      base::Bind(&PrepareFrameAndViewForPrint::CallOnReady,
-                 weak_ptr_factory_.GetWeakPtr()));
-}
-
-blink::WebFrame* PrepareFrameAndViewForPrint::createChildFrame(
-    blink::WebLocalFrame* parent,
-    const blink::WebString& name,
-    blink::WebSandboxFlags sandboxFlags) {
-  blink::WebFrame* frame = blink::WebLocalFrame::create(this);
-  parent->appendChild(frame);
-  return frame;
-}
-
-void PrepareFrameAndViewForPrint::frameDetached(blink::WebFrame* frame) {
-  if (frame->parent())
-    frame->parent()->removeChild(frame);
-  frame->close();
-}
-
-void PrepareFrameAndViewForPrint::CallOnReady() {
-  return on_ready_.Run();  // Can delete |this|.
-}
-
-gfx::Size PrepareFrameAndViewForPrint::GetPrintCanvasSize() const {
-  DCHECK(is_printing_started_);
-  return gfx::Size(web_print_params_.printContentArea.width,
-                   web_print_params_.printContentArea.height);
-}
-
-void PrepareFrameAndViewForPrint::RestoreSize() {
-  if (frame()) {
-    blink::WebView* web_view = frame_.GetFrame()->view();
-    web_view->resize(prev_view_size_);
-    if (blink::WebFrame* web_frame = web_view->mainFrame())
-      web_frame->setScrollOffset(prev_scroll_offset_);
-  }
-}
-
-void PrepareFrameAndViewForPrint::FinishPrinting() {
-  blink::WebLocalFrame* frame = frame_.GetFrame();
-  if (frame) {
-    blink::WebView* web_view = frame->view();
-    if (is_printing_started_) {
-      is_printing_started_ = false;
-      frame->printEnd();
-      if (!owns_web_view_) {
-        web_view->settings()->setShouldPrintBackgrounds(false);
-        RestoreSize();
-      }
-    }
-    if (owns_web_view_) {
-      DCHECK(!frame->isLoading());
-      owns_web_view_ = false;
-      web_view->close();
-    }
-  }
-  frame_.Reset(NULL);
-  on_ready_.Reset();
-}
-
-PrintWebViewHelper::PrintWebViewHelper(content::RenderView* render_view)
-    : content::RenderViewObserver(render_view),
-      content::RenderViewObserverTracker<PrintWebViewHelper>(render_view),
-      reset_prep_frame_view_(false),
-      is_preview_enabled_(IsPrintPreviewEnabled()),
-      is_scripted_print_throttling_disabled_(IsPrintThrottlingDisabled()),
-      is_print_ready_metafile_sent_(false),
-      ignore_css_margins_(false),
-      user_cancelled_scripted_print_count_(0),
-      is_scripted_printing_blocked_(false),
-      notify_browser_of_print_failure_(true),
-      print_for_preview_(false),
-      print_node_in_progress_(false),
-      is_loading_(false),
-      is_scripted_preview_delayed_(false),
-      weak_ptr_factory_(this) {
-  // TODO(sgurun) enable window.print() for webview crbug.com/322303
-  SetScriptedPrintBlocked(true);
-}
-
-PrintWebViewHelper::~PrintWebViewHelper() {}
-
-bool PrintWebViewHelper::IsScriptInitiatedPrintAllowed(
-    blink::WebFrame* frame, bool user_initiated) {
-#if defined(OS_ANDROID)
-  return false;
-#endif  // defined(OS_ANDROID)
-  if (is_scripted_printing_blocked_)
-    return false;
-  // If preview is enabled, then the print dialog is tab modal, and the user
-  // can always close the tab on a mis-behaving page (the system print dialog
-  // is app modal). If the print was initiated through user action, don't
-  // throttle. Or, if the command line flag to skip throttling has been set.
-  if (!is_scripted_print_throttling_disabled_ &&
-      !is_preview_enabled_ &&
-      !user_initiated)
-    return !IsScriptInitiatedPrintTooFrequent(frame);
-  return true;
-}
-
-void PrintWebViewHelper::DidStartLoading() {
-  is_loading_ = true;
-}
-
-void PrintWebViewHelper::DidStopLoading() {
-  is_loading_ = false;
-  ShowScriptedPrintPreview();
-}
-
-// Prints |frame| which called window.print().
-void PrintWebViewHelper::PrintPage(blink::WebLocalFrame* frame,
-                                   bool user_initiated) {
-  DCHECK(frame);
-
-#if !defined(OS_ANDROID)
-  // TODO(sgurun) android_webview hack
-  // Allow Prerendering to cancel this print request if necessary.
-  if (prerender::PrerenderHelper::IsPrerendering(render_view())) {
-    Send(new ChromeViewHostMsg_CancelPrerenderForPrinting(routing_id()));
-    return;
-  }
-#endif  // !defined(OS_ANDROID)
-
-  if (!IsScriptInitiatedPrintAllowed(frame, user_initiated))
-    return;
-  IncrementScriptedPrintCount();
-
-  if (is_preview_enabled_) {
-    print_preview_context_.InitWithFrame(frame);
-    RequestPrintPreview(PRINT_PREVIEW_SCRIPTED);
-  } else {
-    Print(frame, blink::WebNode());
-  }
-}
-
-bool PrintWebViewHelper::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(PrintWebViewHelper, message)
-    IPC_MESSAGE_HANDLER(PrintMsg_PrintPages, OnPrintPages)
-    IPC_MESSAGE_HANDLER(PrintMsg_PrintForSystemDialog, OnPrintForSystemDialog)
-    IPC_MESSAGE_HANDLER(PrintMsg_InitiatePrintPreview, OnInitiatePrintPreview)
-    IPC_MESSAGE_HANDLER(PrintMsg_PrintPreview, OnPrintPreview)
-    IPC_MESSAGE_HANDLER(PrintMsg_PrintForPrintPreview, OnPrintForPrintPreview)
-    IPC_MESSAGE_HANDLER(PrintMsg_PrintingDone, OnPrintingDone)
-    IPC_MESSAGE_HANDLER(PrintMsg_ResetScriptedPrintCount,
-                        ResetScriptedPrintCount)
-    IPC_MESSAGE_HANDLER(PrintMsg_SetScriptedPrintingBlocked,
-                        SetScriptedPrintBlocked)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-    IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void PrintWebViewHelper::OnPrintForPrintPreview(
-    const base::DictionaryValue& job_settings) {
-  DCHECK(is_preview_enabled_);
-  // If still not finished with earlier print request simply ignore.
-  if (prep_frame_view_)
-    return;
-
-  if (!render_view()->GetWebView())
-    return;
-  blink::WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
-  if (!main_frame)
-    return;
-
-  blink::WebDocument document = main_frame->document();
-  // <object> with id="pdf-viewer" is created in
-  // chrome/browser/resources/print_preview/print_preview.js
-  blink::WebElement pdf_element = document.getElementById("pdf-viewer");
-  if (pdf_element.isNull()) {
-    NOTREACHED();
-    return;
-  }
-
-  // Set |print_for_preview_| flag and autoreset it to back to original
-  // on return.
-  base::AutoReset<bool> set_printing_flag(&print_for_preview_, true);
-
-  blink::WebLocalFrame* pdf_frame = pdf_element.document().frame();
-  if (!UpdatePrintSettings(pdf_frame, pdf_element, job_settings)) {
-    LOG(ERROR) << "UpdatePrintSettings failed";
-    DidFinishPrinting(FAIL_PRINT);
-    return;
-  }
-
-  // Print page onto entire page not just printable area. Preview PDF already
-  // has content in correct position taking into account page size and printable
-  // area.
-  // TODO(vitalybuka) : Make this consistent on all platform. This change
-  // affects Windows only. On Linux and OSX RenderPagesForPrint does not use
-  // printable_area. Also we can't change printable_area deeper inside
-  // RenderPagesForPrint for Windows, because it's used also by native
-  // printing and it expects real printable_area value.
-  // See http://crbug.com/123408
-  PrintMsg_Print_Params& print_params = print_pages_params_->params;
-  print_params.printable_area = gfx::Rect(print_params.page_size);
-
-  // Render Pages for printing.
-  if (!RenderPagesForPrint(pdf_frame, pdf_element)) {
-    LOG(ERROR) << "RenderPagesForPrint failed";
-    DidFinishPrinting(FAIL_PRINT);
-  }
-}
-
-bool PrintWebViewHelper::GetPrintFrame(blink::WebLocalFrame** frame) {
-  DCHECK(frame);
-  blink::WebView* webView = render_view()->GetWebView();
-  DCHECK(webView);
-  if (!webView)
-    return false;
-
-  // If the user has selected text in the currently focused frame we print
-  // only that frame (this makes print selection work for multiple frames).
-  blink::WebLocalFrame* focusedFrame =
-      webView->focusedFrame()->toWebLocalFrame();
-  *frame = focusedFrame->hasSelection()
-               ? focusedFrame
-               : webView->mainFrame()->toWebLocalFrame();
-  return true;
-}
-
-void PrintWebViewHelper::OnPrintPages() {
-  blink::WebLocalFrame* frame;
-  if (GetPrintFrame(&frame))
-    Print(frame, blink::WebNode());
-}
-
-void PrintWebViewHelper::OnPrintForSystemDialog() {
-  blink::WebLocalFrame* frame = print_preview_context_.source_frame();
-  if (!frame) {
-    NOTREACHED();
-    return;
-  }
-
-  Print(frame, print_preview_context_.source_node());
-}
-
-void PrintWebViewHelper::GetPageSizeAndContentAreaFromPageLayout(
-    const PageSizeMargins& page_layout_in_points,
-    gfx::Size* page_size,
-    gfx::Rect* content_area) {
-  *page_size = gfx::Size(
-      page_layout_in_points.content_width +
-          page_layout_in_points.margin_right +
-          page_layout_in_points.margin_left,
-      page_layout_in_points.content_height +
-          page_layout_in_points.margin_top +
-          page_layout_in_points.margin_bottom);
-  *content_area = gfx::Rect(page_layout_in_points.margin_left,
-                            page_layout_in_points.margin_top,
-                            page_layout_in_points.content_width,
-                            page_layout_in_points.content_height);
-}
-
-void PrintWebViewHelper::UpdateFrameMarginsCssInfo(
-    const base::DictionaryValue& settings) {
-  int margins_type = 0;
-  if (!settings.GetInteger(kSettingMarginsType, &margins_type))
-    margins_type = DEFAULT_MARGINS;
-  ignore_css_margins_ = (margins_type != DEFAULT_MARGINS);
-}
-
-bool PrintWebViewHelper::IsPrintToPdfRequested(
-    const base::DictionaryValue& job_settings) {
-  bool print_to_pdf = false;
-  if (!job_settings.GetBoolean(kSettingPrintToPDF, &print_to_pdf))
-    NOTREACHED();
-  return print_to_pdf;
-}
-
-blink::WebPrintScalingOption PrintWebViewHelper::GetPrintScalingOption(
-    bool source_is_html, const base::DictionaryValue& job_settings,
-    const PrintMsg_Print_Params& params) {
-  DCHECK(!print_for_preview_);
-
-  if (params.print_to_pdf)
-    return blink::WebPrintScalingOptionSourceSize;
-
-  if (!source_is_html) {
-    if (!FitToPageEnabled(job_settings))
-      return blink::WebPrintScalingOptionNone;
-
-    bool no_plugin_scaling =
-        print_preview_context_.source_frame()->isPrintScalingDisabledForPlugin(
-            print_preview_context_.source_node());
-
-    if (params.is_first_request && no_plugin_scaling)
-      return blink::WebPrintScalingOptionNone;
-  }
-  return blink::WebPrintScalingOptionFitToPrintableArea;
-}
-
-void PrintWebViewHelper::OnPrintPreview(const base::DictionaryValue& settings) {
-  DCHECK(is_preview_enabled_);
-  print_preview_context_.OnPrintPreview();
-
-  UMA_HISTOGRAM_ENUMERATION("PrintPreview.PreviewEvent",
-                            PREVIEW_EVENT_REQUESTED, PREVIEW_EVENT_MAX);
-
-  if (!UpdatePrintSettings(print_preview_context_.source_frame(),
-                           print_preview_context_.source_node(), settings)) {
-    if (print_preview_context_.last_error() != PREVIEW_ERROR_BAD_SETTING) {
-      Send(new PrintHostMsg_PrintPreviewInvalidPrinterSettings(
-          routing_id(), print_pages_params_->params.document_cookie));
-      notify_browser_of_print_failure_ = false;  // Already sent.
-    }
-    DidFinishPrinting(FAIL_PREVIEW);
-    return;
-  }
-
-  // If we are previewing a pdf and the print scaling is disabled, send a
-  // message to browser.
-  if (print_pages_params_->params.is_first_request &&
-      !print_preview_context_.IsModifiable() &&
-      print_preview_context_.source_frame()->isPrintScalingDisabledForPlugin(
-          print_preview_context_.source_node())) {
-    Send(new PrintHostMsg_PrintPreviewScalingDisabled(routing_id()));
-  }
-
-  is_print_ready_metafile_sent_ = false;
-
-  // PDF printer device supports alpha blending.
-  print_pages_params_->params.supports_alpha_blend = true;
-
-  bool generate_draft_pages = false;
-  if (!settings.GetBoolean(kSettingGenerateDraftData,
-                           &generate_draft_pages)) {
-    NOTREACHED();
-  }
-  print_preview_context_.set_generate_draft_pages(generate_draft_pages);
-
-  PrepareFrameForPreviewDocument();
-}
-
-void PrintWebViewHelper::PrepareFrameForPreviewDocument() {
-  reset_prep_frame_view_ = false;
-
-  if (!print_pages_params_ || CheckForCancel()) {
-    DidFinishPrinting(FAIL_PREVIEW);
-    return;
-  }
-
-  // Don't reset loading frame or WebKit will fail assert. Just retry when
-  // current selection is loaded.
-  if (prep_frame_view_ && prep_frame_view_->IsLoadingSelection()) {
-    reset_prep_frame_view_ = true;
-    return;
-  }
-
-  const PrintMsg_Print_Params& print_params = print_pages_params_->params;
-  prep_frame_view_.reset(
-      new PrepareFrameAndViewForPrint(print_params,
-                                      print_preview_context_.source_frame(),
-                                      print_preview_context_.source_node(),
-                                      ignore_css_margins_));
-  prep_frame_view_->CopySelectionIfNeeded(
-      render_view()->GetWebkitPreferences(),
-      base::Bind(&PrintWebViewHelper::OnFramePreparedForPreviewDocument,
-                 base::Unretained(this)));
-}
-
-void PrintWebViewHelper::OnFramePreparedForPreviewDocument() {
-  if (reset_prep_frame_view_) {
-    PrepareFrameForPreviewDocument();
-    return;
-  }
-  DidFinishPrinting(CreatePreviewDocument() ? OK : FAIL_PREVIEW);
-}
-
-bool PrintWebViewHelper::CreatePreviewDocument() {
-  if (!print_pages_params_ || CheckForCancel())
-    return false;
-
-  UMA_HISTOGRAM_ENUMERATION("PrintPreview.PreviewEvent",
-                            PREVIEW_EVENT_CREATE_DOCUMENT, PREVIEW_EVENT_MAX);
-
-  const PrintMsg_Print_Params& print_params = print_pages_params_->params;
-  const std::vector<int>& pages = print_pages_params_->pages;
-
-  if (!print_preview_context_.CreatePreviewDocument(prep_frame_view_.release(),
-                                                    pages)) {
-    return false;
-  }
-
-  PageSizeMargins default_page_layout;
-  ComputePageLayoutInPointsForCss(print_preview_context_.prepared_frame(), 0,
-                                  print_params, ignore_css_margins_, NULL,
-                                  &default_page_layout);
-
-  bool has_page_size_style = PrintingFrameHasPageSizeStyle(
-      print_preview_context_.prepared_frame(),
-      print_preview_context_.total_page_count());
-  int dpi = GetDPI(&print_params);
-
-  gfx::Rect printable_area_in_points(
-      ConvertUnit(print_params.printable_area.x(), dpi, kPointsPerInch),
-      ConvertUnit(print_params.printable_area.y(), dpi, kPointsPerInch),
-      ConvertUnit(print_params.printable_area.width(), dpi, kPointsPerInch),
-      ConvertUnit(print_params.printable_area.height(), dpi, kPointsPerInch));
-
-  // Margins: Send default page layout to browser process.
-  Send(new PrintHostMsg_DidGetDefaultPageLayout(routing_id(),
-                                                default_page_layout,
-                                                printable_area_in_points,
-                                                has_page_size_style));
-
-  PrintHostMsg_DidGetPreviewPageCount_Params params;
-  params.page_count = print_preview_context_.total_page_count();
-  params.is_modifiable = print_preview_context_.IsModifiable();
-  params.document_cookie = print_params.document_cookie;
-  params.preview_request_id = print_params.preview_request_id;
-  params.clear_preview_data = print_preview_context_.generate_draft_pages();
-  Send(new PrintHostMsg_DidGetPreviewPageCount(routing_id(), params));
-  if (CheckForCancel())
-    return false;
-
-  while (!print_preview_context_.IsFinalPageRendered()) {
-    int page_number = print_preview_context_.GetNextPageNumber();
-    DCHECK_GE(page_number, 0);
-    if (!RenderPreviewPage(page_number, print_params))
-      return false;
-
-    if (CheckForCancel())
-      return false;
-
-    // We must call PrepareFrameAndViewForPrint::FinishPrinting() (by way of
-    // print_preview_context_.AllPagesRendered()) before calling
-    // FinalizePrintReadyDocument() when printing a PDF because the plugin
-    // code does not generate output until we call FinishPrinting().  We do not
-    // generate draft pages for PDFs, so IsFinalPageRendered() and
-    // IsLastPageOfPrintReadyMetafile() will be true in the same iteration of
-    // the loop.
-    if (print_preview_context_.IsFinalPageRendered())
-      print_preview_context_.AllPagesRendered();
-
-    if (print_preview_context_.IsLastPageOfPrintReadyMetafile()) {
-      DCHECK(print_preview_context_.IsModifiable() ||
-             print_preview_context_.IsFinalPageRendered());
-      if (!FinalizePrintReadyDocument())
-        return false;
-    }
-  }
-  print_preview_context_.Finished();
-  return true;
-}
-
-bool PrintWebViewHelper::FinalizePrintReadyDocument() {
-  DCHECK(!is_print_ready_metafile_sent_);
-  print_preview_context_.FinalizePrintReadyDocument();
-
-  // Get the size of the resulting metafile.
-  PdfMetafileSkia* metafile = print_preview_context_.metafile();
-  uint32 buf_size = metafile->GetDataSize();
-  DCHECK_GT(buf_size, 0u);
-
-  PrintHostMsg_DidPreviewDocument_Params preview_params;
-  preview_params.reuse_existing_data = false;
-  preview_params.data_size = buf_size;
-  preview_params.document_cookie = print_pages_params_->params.document_cookie;
-  preview_params.expected_pages_count =
-      print_preview_context_.total_page_count();
-  preview_params.modifiable = print_preview_context_.IsModifiable();
-  preview_params.preview_request_id =
-      print_pages_params_->params.preview_request_id;
-
-  // Ask the browser to create the shared memory for us.
-  if (!CopyMetafileDataToSharedMem(metafile,
-                                   &(preview_params.metafile_data_handle))) {
-    LOG(ERROR) << "CopyMetafileDataToSharedMem failed";
-    print_preview_context_.set_error(PREVIEW_ERROR_METAFILE_COPY_FAILED);
-    return false;
-  }
-  is_print_ready_metafile_sent_ = true;
-
-  Send(new PrintHostMsg_MetafileReadyForPrinting(routing_id(), preview_params));
-  return true;
-}
-
-void PrintWebViewHelper::OnPrintingDone(bool success) {
-  notify_browser_of_print_failure_ = false;
-  if (!success)
-    LOG(ERROR) << "Failure in OnPrintingDone";
-  DidFinishPrinting(success ? OK : FAIL_PRINT);
-}
-
-void PrintWebViewHelper::SetScriptedPrintBlocked(bool blocked) {
-  is_scripted_printing_blocked_ = blocked;
-}
-
-void PrintWebViewHelper::OnInitiatePrintPreview(bool selection_only) {
-  DCHECK(is_preview_enabled_);
-  blink::WebLocalFrame* frame = NULL;
-  GetPrintFrame(&frame);
-  DCHECK(frame);
-  print_preview_context_.InitWithFrame(frame);
-  RequestPrintPreview(selection_only ?
-                      PRINT_PREVIEW_USER_INITIATED_SELECTION :
-                      PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME);
-}
-
-bool PrintWebViewHelper::IsPrintingEnabled() {
-  bool result = false;
-  Send(new PrintHostMsg_IsPrintingEnabled(routing_id(), &result));
-  return result;
-}
-
-void PrintWebViewHelper::PrintNode(const blink::WebNode& node) {
-  if (node.isNull() || !node.document().frame()) {
-    // This can occur when the context menu refers to an invalid WebNode.
-    // See http://crbug.com/100890#c17 for a repro case.
-    return;
-  }
-
-  if (print_node_in_progress_) {
-    // This can happen as a result of processing sync messages when printing
-    // from ppapi plugins. It's a rare case, so its OK to just fail here.
-    // See http://crbug.com/159165.
-    return;
-  }
-
-  print_node_in_progress_ = true;
-
-  // Make a copy of the node, in case RenderView::OnContextMenuClosed resets
-  // its |context_menu_node_|.
-  if (is_preview_enabled_) {
-    print_preview_context_.InitWithNode(node);
-    RequestPrintPreview(PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE);
-  } else {
-    blink::WebNode duplicate_node(node);
-    Print(duplicate_node.document().frame(), duplicate_node);
-  }
-
-  print_node_in_progress_ = false;
-}
-
-void PrintWebViewHelper::Print(blink::WebLocalFrame* frame,
-                               const blink::WebNode& node) {
-  // If still not finished with earlier print request simply ignore.
-  if (prep_frame_view_)
-    return;
-
-  FrameReference frame_ref(frame);
-
-  int expected_page_count = 0;
-  if (!CalculateNumberOfPages(frame, node, &expected_page_count)) {
-    DidFinishPrinting(FAIL_PRINT_INIT);
-    return;  // Failed to init print page settings.
-  }
-
-  // Some full screen plugins can say they don't want to print.
-  if (!expected_page_count) {
-    DidFinishPrinting(FAIL_PRINT);
-    return;
-  }
-
-#if !defined(OS_ANDROID)
-  // TODO(sgurun) android_webview hack
-  // Ask the browser to show UI to retrieve the final print settings.
-  if (!GetPrintSettingsFromUser(frame_ref.GetFrame(), node,
-                                expected_page_count)) {
-    DidFinishPrinting(OK);  // Release resources and fail silently.
-    return;
-  }
-#endif  // !defined(OS_ANDROID)
-
-  // Render Pages for printing.
-  if (!RenderPagesForPrint(frame_ref.GetFrame(), node)) {
-    LOG(ERROR) << "RenderPagesForPrint failed";
-    DidFinishPrinting(FAIL_PRINT);
-  }
-  ResetScriptedPrintCount();
-}
-
-void PrintWebViewHelper::DidFinishPrinting(PrintingResult result) {
-  switch (result) {
-    case OK:
-      break;
-
-    case FAIL_PRINT_INIT:
-      DCHECK(!notify_browser_of_print_failure_);
-      break;
-
-    case FAIL_PRINT:
-      if (notify_browser_of_print_failure_ && print_pages_params_.get()) {
-        int cookie = print_pages_params_->params.document_cookie;
-        Send(new PrintHostMsg_PrintingFailed(routing_id(), cookie));
-      }
-      break;
-
-    case FAIL_PREVIEW:
-      DCHECK(is_preview_enabled_);
-      int cookie = print_pages_params_.get() ?
-          print_pages_params_->params.document_cookie : 0;
-      if (notify_browser_of_print_failure_) {
-        LOG(ERROR) << "CreatePreviewDocument failed";
-        Send(new PrintHostMsg_PrintPreviewFailed(routing_id(), cookie));
-      } else {
-        Send(new PrintHostMsg_PrintPreviewCancelled(routing_id(), cookie));
-      }
-      print_preview_context_.Failed(notify_browser_of_print_failure_);
-      break;
-  }
-
-  prep_frame_view_.reset();
-  print_pages_params_.reset();
-  notify_browser_of_print_failure_ = true;
-}
-
-void PrintWebViewHelper::OnFramePreparedForPrintPages() {
-  PrintPages();
-  FinishFramePrinting();
-}
-
-void PrintWebViewHelper::PrintPages() {
-  if (!prep_frame_view_)  // Printing is already canceled or failed.
-    return;
-  prep_frame_view_->StartPrinting();
-
-  int page_count = prep_frame_view_->GetExpectedPageCount();
-  if (!page_count) {
-    LOG(ERROR) << "Can't print 0 pages.";
-    return DidFinishPrinting(FAIL_PRINT);
-  }
-
-  const PrintMsg_PrintPages_Params& params = *print_pages_params_;
-  const PrintMsg_Print_Params& print_params = params.params;
-
-#if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
-  // TODO(vitalybuka): should be page_count or valid pages from params.pages.
-  // See http://crbug.com/161576
-  Send(new PrintHostMsg_DidGetPrintedPagesCount(routing_id(),
-                                                print_params.document_cookie,
-                                                page_count));
-#endif  // !defined(OS_CHROMEOS)
-
-  if (print_params.preview_ui_id < 0) {
-    // Printing for system dialog.
-    int printed_count = params.pages.empty() ? page_count : params.pages.size();
-#if !defined(OS_CHROMEOS)
-    UMA_HISTOGRAM_COUNTS("PrintPreview.PageCount.SystemDialog", printed_count);
-#else
-    UMA_HISTOGRAM_COUNTS("PrintPreview.PageCount.PrintToCloudPrintWebDialog",
-                         printed_count);
-#endif  // !defined(OS_CHROMEOS)
-  }
-
-
-  if (!PrintPagesNative(prep_frame_view_->frame(), page_count,
-                        prep_frame_view_->GetPrintCanvasSize())) {
-    LOG(ERROR) << "Printing failed.";
-    return DidFinishPrinting(FAIL_PRINT);
-  }
-}
-
-void PrintWebViewHelper::FinishFramePrinting() {
-  prep_frame_view_.reset();
-}
-
-#if defined(OS_MACOSX) || defined(OS_WIN)
-bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
-                                          int page_count,
-                                          const gfx::Size& canvas_size) {
-  const PrintMsg_PrintPages_Params& params = *print_pages_params_;
-  const PrintMsg_Print_Params& print_params = params.params;
-
-  PrintMsg_PrintPage_Params page_params;
-  page_params.params = print_params;
-  if (params.pages.empty()) {
-    for (int i = 0; i < page_count; ++i) {
-      page_params.page_number = i;
-      PrintPageInternal(page_params, canvas_size, frame);
-    }
-  } else {
-    for (size_t i = 0; i < params.pages.size(); ++i) {
-      if (params.pages[i] >= page_count)
-        break;
-      page_params.page_number = params.pages[i];
-      PrintPageInternal(page_params, canvas_size, frame);
-    }
-  }
-  return true;
-}
-
-#endif  // OS_MACOSX || OS_WIN
-
-// static - Not anonymous so that platform implementations can use it.
-void PrintWebViewHelper::ComputePageLayoutInPointsForCss(
-    blink::WebFrame* frame,
-    int page_index,
-    const PrintMsg_Print_Params& page_params,
-    bool ignore_css_margins,
-    double* scale_factor,
-    PageSizeMargins* page_layout_in_points) {
-  PrintMsg_Print_Params params = CalculatePrintParamsForCss(
-      frame, page_index, page_params, ignore_css_margins,
-      page_params.print_scaling_option ==
-          blink::WebPrintScalingOptionFitToPrintableArea,
-      scale_factor);
-  CalculatePageLayoutFromPrintParams(params, page_layout_in_points);
-}
-
-bool PrintWebViewHelper::InitPrintSettings(bool fit_to_paper_size) {
-  PrintMsg_PrintPages_Params settings;
-  Send(new PrintHostMsg_GetDefaultPrintSettings(routing_id(),
-                                                &settings.params));
-  // Check if the printer returned any settings, if the settings is empty, we
-  // can safely assume there are no printer drivers configured. So we safely
-  // terminate.
-  bool result = true;
-  if (!PrintMsg_Print_Params_IsValid(settings.params))
-    result = false;
-
-  if (result &&
-      (settings.params.dpi < kMinDpi || settings.params.document_cookie == 0)) {
-    // Invalid print page settings.
-    NOTREACHED();
-    result = false;
-  }
-
-  // Reset to default values.
-  ignore_css_margins_ = false;
-  settings.pages.clear();
-
-  settings.params.print_scaling_option =
-      blink::WebPrintScalingOptionSourceSize;
-  if (fit_to_paper_size) {
-    settings.params.print_scaling_option =
-        blink::WebPrintScalingOptionFitToPrintableArea;
-  }
-
-  print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
-  return result;
-}
-
-bool PrintWebViewHelper::CalculateNumberOfPages(blink::WebLocalFrame* frame,
-                                                const blink::WebNode& node,
-                                                int* number_of_pages) {
-  DCHECK(frame);
-  bool fit_to_paper_size = !(PrintingNodeOrPdfFrame(frame, node));
-  if (!InitPrintSettings(fit_to_paper_size)) {
-    notify_browser_of_print_failure_ = false;
-#if !defined(OS_ANDROID)
-    // TODO(sgurun) android_webview hack
-    render_view()->RunModalAlertDialog(
-        frame,
-        l10n_util::GetStringUTF16(IDS_PRINT_INVALID_PRINTER_SETTINGS));
-#endif  //  !defined(OS_ANDROID)
-    return false;
-  }
-
-  const PrintMsg_Print_Params& params = print_pages_params_->params;
-  PrepareFrameAndViewForPrint prepare(params, frame, node, ignore_css_margins_);
-  prepare.StartPrinting();
-
-  Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
-                                             params.document_cookie));
-  *number_of_pages = prepare.GetExpectedPageCount();
-  return true;
-}
-
-bool PrintWebViewHelper::UpdatePrintSettings(
-    blink::WebLocalFrame* frame,
-    const blink::WebNode& node,
-    const base::DictionaryValue& passed_job_settings) {
-  DCHECK(is_preview_enabled_);
-  const base::DictionaryValue* job_settings = &passed_job_settings;
-  base::DictionaryValue modified_job_settings;
-  if (job_settings->empty()) {
-    if (!print_for_preview_)
-      print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
-    return false;
-  }
-
-  bool source_is_html = true;
-  if (print_for_preview_) {
-    if (!job_settings->GetBoolean(kSettingPreviewModifiable, &source_is_html)) {
-      NOTREACHED();
-    }
-  } else {
-    source_is_html = !PrintingNodeOrPdfFrame(frame, node);
-  }
-
-  if (print_for_preview_ || !source_is_html) {
-    modified_job_settings.MergeDictionary(job_settings);
-    modified_job_settings.SetBoolean(kSettingHeaderFooterEnabled, false);
-    modified_job_settings.SetInteger(kSettingMarginsType, NO_MARGINS);
-    job_settings = &modified_job_settings;
-  }
-
-  // Send the cookie so that UpdatePrintSettings can reuse PrinterQuery when
-  // possible.
-  int cookie = print_pages_params_.get() ?
-      print_pages_params_->params.document_cookie : 0;
-  PrintMsg_PrintPages_Params settings;
-  Send(new PrintHostMsg_UpdatePrintSettings(routing_id(), cookie, *job_settings,
-                                            &settings));
-  print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
-
-  if (!PrintMsg_Print_Params_IsValid(settings.params)) {
-    if (!print_for_preview_) {
-      print_preview_context_.set_error(PREVIEW_ERROR_INVALID_PRINTER_SETTINGS);
-    } else {
-#if !defined(OS_ANDROID)
-      // TODO(sgurun) android_webview hack
-      // PrintForPrintPreview
-      blink::WebFrame* print_frame = NULL;
-      // This may not be the right frame, but the alert will be modal,
-      // therefore it works well enough.
-      GetPrintFrame(&print_frame);
-      if (print_frame) {
-        render_view()->RunModalAlertDialog(
-            print_frame,
-            l10n_util::GetStringUTF16(
-                IDS_PRINT_INVALID_PRINTER_SETTINGS));
-      }
-#endif  // !defined(OS_ANDROID)
-    }
-    return false;
-  }
-
-  if (settings.params.dpi < kMinDpi || !settings.params.document_cookie) {
-    print_preview_context_.set_error(PREVIEW_ERROR_UPDATING_PRINT_SETTINGS);
-    return false;
-  }
-
-  if (!job_settings->GetInteger(kPreviewUIID, &settings.params.preview_ui_id)) {
-    NOTREACHED();
-    print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
-    return false;
-  }
-
-  if (!print_for_preview_) {
-    // Validate expected print preview settings.
-    if (!job_settings->GetInteger(kPreviewRequestID,
-                                  &settings.params.preview_request_id) ||
-        !job_settings->GetBoolean(kIsFirstRequest,
-                                  &settings.params.is_first_request)) {
-      NOTREACHED();
-      print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
-      return false;
-    }
-
-    settings.params.print_to_pdf = IsPrintToPdfRequested(*job_settings);
-    UpdateFrameMarginsCssInfo(*job_settings);
-    settings.params.print_scaling_option = GetPrintScalingOption(
-        source_is_html, *job_settings, settings.params);
-
-    // Header/Footer: Set |header_footer_info_|.
-    if (settings.params.display_header_footer) {
-      header_footer_info_.reset(new base::DictionaryValue());
-      header_footer_info_->SetDouble(kSettingHeaderFooterDate,
-                                     base::Time::Now().ToJsTime());
-      header_footer_info_->SetString(kSettingHeaderFooterURL,
-                                     settings.params.url);
-      header_footer_info_->SetString(kSettingHeaderFooterTitle,
-                                     settings.params.title);
-    }
-  }
-
-  print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
-  Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
-                                             settings.params.document_cookie));
-
-  return true;
-}
-
-bool PrintWebViewHelper::GetPrintSettingsFromUser(blink::WebFrame* frame,
-                                                  const blink::WebNode& node,
-                                                  int expected_pages_count) {
-  PrintHostMsg_ScriptedPrint_Params params;
-  PrintMsg_PrintPages_Params print_settings;
-
-  params.cookie = print_pages_params_->params.document_cookie;
-  params.has_selection = frame->hasSelection();
-  params.expected_pages_count = expected_pages_count;
-  MarginType margin_type = DEFAULT_MARGINS;
-  if (PrintingNodeOrPdfFrame(frame, node))
-    margin_type = GetMarginsForPdf(frame, node);
-  params.margin_type = margin_type;
-
-  Send(new PrintHostMsg_DidShowPrintDialog(routing_id()));
-
-  // PrintHostMsg_ScriptedPrint will reset print_scaling_option, so we save the
-  // value before and restore it afterwards.
-  blink::WebPrintScalingOption scaling_option =
-      print_pages_params_->params.print_scaling_option;
-
-  print_pages_params_.reset();
-  IPC::SyncMessage* msg =
-      new PrintHostMsg_ScriptedPrint(routing_id(), params, &print_settings);
-  msg->EnableMessagePumping();
-  Send(msg);
-  print_pages_params_.reset(new PrintMsg_PrintPages_Params(print_settings));
-
-  print_pages_params_->params.print_scaling_option = scaling_option;
-  return (print_settings.params.dpi && print_settings.params.document_cookie);
-}
-
-bool PrintWebViewHelper::RenderPagesForPrint(blink::WebLocalFrame* frame,
-                                             const blink::WebNode& node) {
-  if (!frame || prep_frame_view_)
-    return false;
-  const PrintMsg_PrintPages_Params& params = *print_pages_params_;
-  const PrintMsg_Print_Params& print_params = params.params;
-  prep_frame_view_.reset(new PrepareFrameAndViewForPrint(
-      print_params, frame, node, ignore_css_margins_));
-  DCHECK(!print_pages_params_->params.selection_only ||
-         print_pages_params_->pages.empty());
-  prep_frame_view_->CopySelectionIfNeeded(
-      render_view()->GetWebkitPreferences(),
-      base::Bind(&PrintWebViewHelper::OnFramePreparedForPrintPages,
-                 base::Unretained(this)));
-  return true;
-}
-
-#if defined(OS_POSIX)
-bool PrintWebViewHelper::CopyMetafileDataToSharedMem(
-    PdfMetafileSkia* metafile,
-    base::SharedMemoryHandle* shared_mem_handle) {
-  uint32 buf_size = metafile->GetDataSize();
-  scoped_ptr<base::SharedMemory> shared_buf(
-      content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(
-          buf_size).release());
-
-  if (shared_buf.get()) {
-    if (shared_buf->Map(buf_size)) {
-      metafile->GetData(shared_buf->memory(), buf_size);
-      shared_buf->GiveToProcess(base::GetCurrentProcessHandle(),
-                                shared_mem_handle);
-      return true;
-    }
-  }
-  NOTREACHED();
-  return false;
-}
-#endif  // defined(OS_POSIX)
-
-bool PrintWebViewHelper::IsScriptInitiatedPrintTooFrequent(
-    blink::WebFrame* frame) {
-  const int kMinSecondsToIgnoreJavascriptInitiatedPrint = 2;
-  const int kMaxSecondsToIgnoreJavascriptInitiatedPrint = 32;
-  bool too_frequent = false;
-
-  // Check if there is script repeatedly trying to print and ignore it if too
-  // frequent.  The first 3 times, we use a constant wait time, but if this
-  // gets excessive, we switch to exponential wait time. So for a page that
-  // calls print() in a loop the user will need to cancel the print dialog
-  // after: [2, 2, 2, 4, 8, 16, 32, 32, ...] seconds.
-  // This gives the user time to navigate from the page.
-  if (user_cancelled_scripted_print_count_ > 0) {
-    base::TimeDelta diff = base::Time::Now() - last_cancelled_script_print_;
-    int min_wait_seconds = kMinSecondsToIgnoreJavascriptInitiatedPrint;
-    if (user_cancelled_scripted_print_count_ > 3) {
-      min_wait_seconds = std::min(
-          kMinSecondsToIgnoreJavascriptInitiatedPrint <<
-              (user_cancelled_scripted_print_count_ - 3),
-          kMaxSecondsToIgnoreJavascriptInitiatedPrint);
-    }
-    if (diff.InSeconds() < min_wait_seconds) {
-      too_frequent = true;
-    }
-  }
-
-  if (!too_frequent)
-    return false;
-
-  blink::WebString message(
-      blink::WebString::fromUTF8("Ignoring too frequent calls to print()."));
-  frame->addMessageToConsole(
-      blink::WebConsoleMessage(
-          blink::WebConsoleMessage::LevelWarning, message));
-  return true;
-}
-
-void PrintWebViewHelper::ResetScriptedPrintCount() {
-  // Reset cancel counter on successful print.
-  user_cancelled_scripted_print_count_ = 0;
-}
-
-void PrintWebViewHelper::IncrementScriptedPrintCount() {
-  ++user_cancelled_scripted_print_count_;
-  last_cancelled_script_print_ = base::Time::Now();
-}
-
-void PrintWebViewHelper::ShowScriptedPrintPreview() {
-  if (is_scripted_preview_delayed_) {
-    is_scripted_preview_delayed_ = false;
-    Send(new PrintHostMsg_ShowScriptedPrintPreview(routing_id(),
-            print_preview_context_.IsModifiable()));
-  }
-}
-
-void PrintWebViewHelper::RequestPrintPreview(PrintPreviewRequestType type) {
-  const bool is_modifiable = print_preview_context_.IsModifiable();
-  const bool has_selection = print_preview_context_.HasSelection();
-  PrintHostMsg_RequestPrintPreview_Params params;
-  params.is_modifiable = is_modifiable;
-  params.has_selection = has_selection;
-  switch (type) {
-    case PRINT_PREVIEW_SCRIPTED: {
-      // Shows scripted print preview in two stages.
-      // 1. PrintHostMsg_SetupScriptedPrintPreview blocks this call and JS by
-      //    pumping messages here.
-      // 2. PrintHostMsg_ShowScriptedPrintPreview shows preview once the
-      //    document has been loaded.
-      is_scripted_preview_delayed_ = true;
-      if (is_loading_ && GetPlugin(print_preview_context_.source_frame())) {
-        // Wait for DidStopLoading. Plugins may not know the correct
-        // |is_modifiable| value until they are fully loaded, which occurs when
-        // DidStopLoading() is called. Defer showing the preview until then.
-      } else {
-        base::MessageLoop::current()->PostTask(
-            FROM_HERE,
-            base::Bind(&PrintWebViewHelper::ShowScriptedPrintPreview,
-                       weak_ptr_factory_.GetWeakPtr()));
-      }
-      IPC::SyncMessage* msg =
-          new PrintHostMsg_SetupScriptedPrintPreview(routing_id());
-      msg->EnableMessagePumping();
-      Send(msg);
-      is_scripted_preview_delayed_ = false;
-      return;
-    }
-    case PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME: {
-      break;
-    }
-    case PRINT_PREVIEW_USER_INITIATED_SELECTION: {
-      DCHECK(has_selection);
-      params.selection_only = has_selection;
-      break;
-    }
-    case PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE: {
-      params.webnode_only = true;
-      break;
-    }
-    default: {
-      NOTREACHED();
-      return;
-    }
-  }
-  Send(new PrintHostMsg_RequestPrintPreview(routing_id(), params));
-}
-
-bool PrintWebViewHelper::CheckForCancel() {
-  const PrintMsg_Print_Params& print_params = print_pages_params_->params;
-  bool cancel = false;
-  Send(new PrintHostMsg_CheckForCancel(routing_id(),
-                                       print_params.preview_ui_id,
-                                       print_params.preview_request_id,
-                                       &cancel));
-  if (cancel)
-    notify_browser_of_print_failure_ = false;
-  return cancel;
-}
-
-bool PrintWebViewHelper::PreviewPageRendered(int page_number,
-                                             PdfMetafileSkia* metafile) {
-  DCHECK_GE(page_number, FIRST_PAGE_INDEX);
-
-  // For non-modifiable files, |metafile| should be NULL, so do not bother
-  // sending a message. If we don't generate draft metafiles, |metafile| is
-  // NULL.
-  if (!print_preview_context_.IsModifiable() ||
-      !print_preview_context_.generate_draft_pages()) {
-    DCHECK(!metafile);
-    return true;
-  }
-
-  if (!metafile) {
-    NOTREACHED();
-    print_preview_context_.set_error(
-        PREVIEW_ERROR_PAGE_RENDERED_WITHOUT_METAFILE);
-    return false;
-  }
-
-  PrintHostMsg_DidPreviewPage_Params preview_page_params;
-  // Get the size of the resulting metafile.
-  uint32 buf_size = metafile->GetDataSize();
-  DCHECK_GT(buf_size, 0u);
-  if (!CopyMetafileDataToSharedMem(
-      metafile, &(preview_page_params.metafile_data_handle))) {
-    LOG(ERROR) << "CopyMetafileDataToSharedMem failed";
-    print_preview_context_.set_error(PREVIEW_ERROR_METAFILE_COPY_FAILED);
-    return false;
-  }
-  preview_page_params.data_size = buf_size;
-  preview_page_params.page_number = page_number;
-  preview_page_params.preview_request_id =
-      print_pages_params_->params.preview_request_id;
-
-  Send(new PrintHostMsg_DidPreviewPage(routing_id(), preview_page_params));
-  return true;
-}
-
-PrintWebViewHelper::PrintPreviewContext::PrintPreviewContext()
-    : total_page_count_(0),
-      current_page_index_(0),
-      generate_draft_pages_(true),
-      print_ready_metafile_page_count_(0),
-      error_(PREVIEW_ERROR_NONE),
-      state_(UNINITIALIZED) {
-}
-
-PrintWebViewHelper::PrintPreviewContext::~PrintPreviewContext() {
-}
-
-void PrintWebViewHelper::PrintPreviewContext::InitWithFrame(
-    blink::WebLocalFrame* web_frame) {
-  DCHECK(web_frame);
-  DCHECK(!IsRendering());
-  state_ = INITIALIZED;
-  source_frame_.Reset(web_frame);
-  source_node_.reset();
-}
-
-void PrintWebViewHelper::PrintPreviewContext::InitWithNode(
-    const blink::WebNode& web_node) {
-  DCHECK(!web_node.isNull());
-  DCHECK(web_node.document().frame());
-  DCHECK(!IsRendering());
-  state_ = INITIALIZED;
-  source_frame_.Reset(web_node.document().frame());
-  source_node_ = web_node;
-}
-
-void PrintWebViewHelper::PrintPreviewContext::OnPrintPreview() {
-  DCHECK_EQ(INITIALIZED, state_);
-  ClearContext();
-}
-
-bool PrintWebViewHelper::PrintPreviewContext::CreatePreviewDocument(
-    PrepareFrameAndViewForPrint* prepared_frame,
-    const std::vector<int>& pages) {
-  DCHECK_EQ(INITIALIZED, state_);
-  state_ = RENDERING;
-
-  // Need to make sure old object gets destroyed first.
-  prep_frame_view_.reset(prepared_frame);
-  prep_frame_view_->StartPrinting();
-
-  total_page_count_ = prep_frame_view_->GetExpectedPageCount();
-  if (total_page_count_ == 0) {
-    LOG(ERROR) << "CreatePreviewDocument got 0 page count";
-    set_error(PREVIEW_ERROR_ZERO_PAGES);
-    return false;
-  }
-
-  metafile_.reset(new PdfMetafileSkia);
-  if (!metafile_->Init()) {
-    set_error(PREVIEW_ERROR_METAFILE_INIT_FAILED);
-    LOG(ERROR) << "PdfMetafileSkia Init failed";
-    return false;
-  }
-
-  current_page_index_ = 0;
-  pages_to_render_ = pages;
-  // Sort and make unique.
-  std::sort(pages_to_render_.begin(), pages_to_render_.end());
-  pages_to_render_.resize(std::unique(pages_to_render_.begin(),
-                                      pages_to_render_.end()) -
-                          pages_to_render_.begin());
-  // Remove invalid pages.
-  pages_to_render_.resize(std::lower_bound(pages_to_render_.begin(),
-                                           pages_to_render_.end(),
-                                           total_page_count_) -
-                          pages_to_render_.begin());
-  print_ready_metafile_page_count_ = pages_to_render_.size();
-  if (pages_to_render_.empty()) {
-    print_ready_metafile_page_count_ = total_page_count_;
-    // Render all pages.
-    for (int i = 0; i < total_page_count_; ++i)
-      pages_to_render_.push_back(i);
-  } else if (generate_draft_pages_) {
-    int pages_index = 0;
-    for (int i = 0; i < total_page_count_; ++i) {
-      if (pages_index < print_ready_metafile_page_count_ &&
-          i == pages_to_render_[pages_index]) {
-        pages_index++;
-        continue;
-      }
-      pages_to_render_.push_back(i);
-    }
-  }
-
-  document_render_time_ = base::TimeDelta();
-  begin_time_ = base::TimeTicks::Now();
-
-  return true;
-}
-
-void PrintWebViewHelper::PrintPreviewContext::RenderedPreviewPage(
-    const base::TimeDelta& page_time) {
-  DCHECK_EQ(RENDERING, state_);
-  document_render_time_ += page_time;
-  UMA_HISTOGRAM_TIMES("PrintPreview.RenderPDFPageTime", page_time);
-}
-
-void PrintWebViewHelper::PrintPreviewContext::AllPagesRendered() {
-  DCHECK_EQ(RENDERING, state_);
-  state_ = DONE;
-  prep_frame_view_->FinishPrinting();
-}
-
-void PrintWebViewHelper::PrintPreviewContext::FinalizePrintReadyDocument() {
-  DCHECK(IsRendering());
-
-  base::TimeTicks begin_time = base::TimeTicks::Now();
-  metafile_->FinishDocument();
-
-  if (print_ready_metafile_page_count_ <= 0) {
-    NOTREACHED();
-    return;
-  }
-
-  UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderToPDFTime",
-                             document_render_time_);
-  base::TimeDelta total_time = (base::TimeTicks::Now() - begin_time) +
-                               document_render_time_;
-  UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTime",
-                             total_time);
-  UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTimeAvgPerPage",
-                             total_time / pages_to_render_.size());
-}
-
-void PrintWebViewHelper::PrintPreviewContext::Finished() {
-  DCHECK_EQ(DONE, state_);
-  state_ = INITIALIZED;
-  ClearContext();
-}
-
-void PrintWebViewHelper::PrintPreviewContext::Failed(bool report_error) {
-  DCHECK(state_ == INITIALIZED || state_ == RENDERING);
-  state_ = INITIALIZED;
-  if (report_error) {
-    DCHECK_NE(PREVIEW_ERROR_NONE, error_);
-    UMA_HISTOGRAM_ENUMERATION("PrintPreview.RendererError", error_,
-                              PREVIEW_ERROR_LAST_ENUM);
-  }
-  ClearContext();
-}
-
-int PrintWebViewHelper::PrintPreviewContext::GetNextPageNumber() {
-  DCHECK_EQ(RENDERING, state_);
-  if (IsFinalPageRendered())
-    return -1;
-  return pages_to_render_[current_page_index_++];
-}
-
-bool PrintWebViewHelper::PrintPreviewContext::IsRendering() const {
-  return state_ == RENDERING || state_ == DONE;
-}
-
-bool PrintWebViewHelper::PrintPreviewContext::IsModifiable() {
-  // The only kind of node we can print right now is a PDF node.
-  return !PrintingNodeOrPdfFrame(source_frame(), source_node_);
-}
-
-bool PrintWebViewHelper::PrintPreviewContext::HasSelection() {
-  return IsModifiable() && source_frame()->hasSelection();
-}
-
-bool PrintWebViewHelper::PrintPreviewContext::IsLastPageOfPrintReadyMetafile()
-    const {
-  DCHECK(IsRendering());
-  return current_page_index_ == print_ready_metafile_page_count_;
-}
-
-bool  PrintWebViewHelper::PrintPreviewContext::IsFinalPageRendered() const {
-  DCHECK(IsRendering());
-  return static_cast<size_t>(current_page_index_) == pages_to_render_.size();
-}
-
-void PrintWebViewHelper::PrintPreviewContext::set_generate_draft_pages(
-    bool generate_draft_pages) {
-  DCHECK_EQ(INITIALIZED, state_);
-  generate_draft_pages_ = generate_draft_pages;
-}
-
-void PrintWebViewHelper::PrintPreviewContext::set_error(
-    enum PrintPreviewErrorBuckets error) {
-  error_ = error;
-}
-
-blink::WebLocalFrame* PrintWebViewHelper::PrintPreviewContext::source_frame() {
-  DCHECK_NE(UNINITIALIZED, state_);
-  return source_frame_.GetFrame();
-}
-
-const blink::WebNode&
-    PrintWebViewHelper::PrintPreviewContext::source_node() const {
-  DCHECK_NE(UNINITIALIZED, state_);
-  return source_node_;
-}
-
-blink::WebLocalFrame*
-PrintWebViewHelper::PrintPreviewContext::prepared_frame() {
-  DCHECK_NE(UNINITIALIZED, state_);
-  return prep_frame_view_->frame();
-}
-
-const blink::WebNode&
-    PrintWebViewHelper::PrintPreviewContext::prepared_node() const {
-  DCHECK_NE(UNINITIALIZED, state_);
-  return prep_frame_view_->node();
-}
-
-int PrintWebViewHelper::PrintPreviewContext::total_page_count() const {
-  DCHECK_NE(UNINITIALIZED, state_);
-  return total_page_count_;
-}
-
-bool PrintWebViewHelper::PrintPreviewContext::generate_draft_pages() const {
-  return generate_draft_pages_;
-}
-
-PdfMetafileSkia* PrintWebViewHelper::PrintPreviewContext::metafile() {
-  DCHECK(IsRendering());
-  return metafile_.get();
-}
-
-int PrintWebViewHelper::PrintPreviewContext::last_error() const {
-  return error_;
-}
-
-gfx::Size PrintWebViewHelper::PrintPreviewContext::GetPrintCanvasSize() const {
-  DCHECK(IsRendering());
-  return prep_frame_view_->GetPrintCanvasSize();
-}
-
-void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
-  prep_frame_view_.reset();
-  metafile_.reset();
-  pages_to_render_.clear();
-  error_ = PREVIEW_ERROR_NONE;
-}
-
-}  // namespace printing