Plumb physical backing size from RWHV to renderer CC.

content/browser/renderer_host/render_widget_host_view_base.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 "content/browser/renderer_host/render_widget_host_view_base.h"
 
 #include "base/logging.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/port/browser/smooth_scroll_gesture.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
+#include "ui/gfx/size_conversions.h"
+#include "ui/gfx/size_f.h"
 
 #if defined(OS_WIN)
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/win/wrapped_window_proc.h"
 #include "content/browser/plugin_process_host.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/common/content_switches.h"
 #include "ui/base/win/hwnd_util.h"
@@ skipping 333 matching lines @@
 }
 
 void RenderWidgetHostViewBase::SetBackground(const SkBitmap& background) {
   background_ = background;
 }
 
 const SkBitmap& RenderWidgetHostViewBase::GetBackground() {
   return background_;
 }
 
+gfx::Size RenderWidgetHostViewBase::GetPhysicalBackingSize() const {
+  gfx::Display display =
+      gfx::Screen::GetNativeScreen()->GetDisplayNearestPoint(
+          GetViewBounds().origin());
+  return gfx::ToCeiledSize(gfx::ScaleSize(GetViewBounds().size(),
+                                          display.device_scale_factor()));
+}
+
 void RenderWidgetHostViewBase::SelectionChanged(const string16& text,
                                                 size_t offset,
                                                 const ui::Range& range) {
   selection_text_ = text;
   selection_text_offset_ = offset;
   selection_range_.set_start(range.start());
   selection_range_.set_end(range.end());
 }
 
 bool RenderWidgetHostViewBase::IsShowingContextMenu() const {
@@ skipping 47 matching lines @@
 
   if (impl)
     impl->SendScreenRects();
 
   gfx::Display display =
       gfx::Screen::GetScreenFor(view)->GetDisplayNearestPoint(
           GetViewBounds().origin());
   if (current_display_area_ == display.work_area() &&
       current_device_scale_factor_ == display.device_scale_factor())
     return;
+
+  bool device_scale_factor_changed =
+      current_device_scale_factor_ != display.device_scale_factor();
   current_display_area_ = display.work_area();
   current_device_scale_factor_ = display.device_scale_factor();
-  if (impl)
+  if (impl) {
+    if (device_scale_factor_changed)
+        impl->WasResized();
     impl->NotifyScreenInfoChanged();
   }
+}
 
 SmoothScrollGesture* RenderWidgetHostViewBase::CreateSmoothScrollGesture(
     bool scroll_down, int pixels_to_scroll, int mouse_event_x,
     int mouse_event_y) {
   return new BasicMouseWheelSmoothScrollGesture(scroll_down, pixels_to_scroll,
                                                 mouse_event_x, mouse_event_y);
 }
 
 void RenderWidgetHostViewBase::ProcessAckedTouchEvent(
     const WebKit::WebTouchEvent& touch, InputEventAckState ack_result) {
 }
 
 }  // namespace content