Plumb physical backing size from RWHV to renderer CC.

content/browser/renderer_host/render_widget_host_impl.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_impl.h"
 
 #include <math.h>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 463 matching lines @@
 
 void RenderWidgetHostImpl::WasResized() {
   if (resize_ack_pending_ || !process_->HasConnection() || !view_ ||
       !renderer_initialized_ || should_auto_resize_) {
     return;
   }
 
   gfx::Rect view_bounds = view_->GetViewBounds();
   gfx::Size new_size(view_bounds.size());
 
+  gfx::Size old_physical_backing_size = physical_backing_size_;
+  physical_backing_size_ = view_->GetPhysicalBackingSize();
   bool was_fullscreen = is_fullscreen_;
   is_fullscreen_ = IsFullscreen();
-  bool fullscreen_changed = was_fullscreen != is_fullscreen_;
+
   bool size_changed = new_size != current_size_;
+  bool side_payload_changed =
+      old_physical_backing_size != physical_backing_size_ ||
+      was_fullscreen != is_fullscreen_;
 
-  // Avoid asking the RenderWidget to resize to its current size, since it
-  // won't send us a PaintRect message in that case.
-  if (!size_changed && !fullscreen_changed)
+  if (!size_changed && !side_payload_changed)
     return;
 
   if (in_flight_size_ != gfx::Size() && new_size == in_flight_size_ &&
-      !fullscreen_changed)
+      !side_payload_changed)
     return;
 
-  // We don't expect to receive an ACK when the requested size is empty.
+  // We don't expect to receive an ACK when the requested size is empty or when
+  // the main viewport size didn't change.
   if (!new_size.IsEmpty() && size_changed)
     resize_ack_pending_ = true;
 
-  if (!Send(new ViewMsg_Resize(routing_id_, new_size,
-          GetRootWindowResizerRect(), is_fullscreen_))) {
+  if (!Send(new ViewMsg_Resize(routing_id_, new_size, physical_backing_size_,
+                               GetRootWindowResizerRect(), is_fullscreen_))) {
     resize_ack_pending_ = false;
   } else {
     in_flight_size_ = new_size;
   }
 }
 
 void RenderWidgetHostImpl::ResizeRectChanged(const gfx::Rect& new_rect) {
   Send(new ViewMsg_ChangeResizeRect(routing_id_, new_rect));
 }
 
@@ skipping 1873 matching lines @@
     return;
 
   OnRenderAutoResized(new_size);
 }
 
 void RenderWidgetHostImpl::DetachDelegate() {
   delegate_ = NULL;
 }
 
 }  // namespace content