Implemented explicit resizing from guestview.

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 <set>
 #include <utility>
 
@@ skipping 580 matching lines @@
   }
 
   old_resize_params_ =
       make_scoped_ptr(new ViewMsg_Resize_Params(resize_params));
 }
 
 void RenderWidgetHostImpl::WasResized() {
   // Skip if the |delegate_| has already been detached because
   // it's web contents is being deleted.
   if (resize_ack_pending_ || !process_->HasConnection() || !view_ ||
-      !renderer_initialized_ || auto_resize_enabled_ || !delegate_) {
+      !renderer_initialized_ || !delegate_)
+    return;
+
+  // |old_resize_params_| needs to be cleared when autoresize is enabled,
+  // because the next time a regular resize occurs, it is not meaningful to
+  // compare its new size to the old size from before autoresizing.
+  if (auto_resize_enabled_) {
+    old_resize_params_.reset();

[Fady Samuel, 2015/01/12 23:13:56]

To land this, you're going to need to put it in a separate patch with a test.

[paulmeyer, 2015/01/12 23:25:19]

Acknowledged.

     return;
   }
 
   bool size_changed = true;
   bool side_payload_changed = screen_info_out_of_date_;
   scoped_ptr<ViewMsg_Resize_Params> params(new ViewMsg_Resize_Params);
 
   GetResizeParams(params.get());
   if (old_resize_params_) {
     size_changed = old_resize_params_->new_size != params->new_size;
@@ skipping 1547 matching lines @@
 }
 #endif
 
 SkColorType RenderWidgetHostImpl::PreferredReadbackFormat() {
   if (view_)
     return view_->PreferredReadbackFormat();
   return kN32_SkColorType;
 }
 
 }  // namespace content