Ensure Surface size always matches window size on swap

content/browser/compositor/gpu_process_transport_factory.cc

 // Copyright 2014 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/compositor/gpu_process_transport_factory.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 220 matching lines @@
     }
     scoped_ptr<OnscreenDisplayClient> display_client(new OnscreenDisplayClient(
         display_surface.Pass(), manager, compositor->GetRendererSettings(),
         compositor->task_runner()));
 
     scoped_ptr<SurfaceDisplayOutputSurface> output_surface(
         new SurfaceDisplayOutputSurface(
             manager, compositor->surface_id_allocator(), context_provider));
     display_client->set_surface_output_surface(output_surface.get());
     output_surface->set_display_client(display_client.get());
+    display_client->display()->Resize(compositor->size());
     data->display_client = display_client.Pass();
     compositor->SetOutputSurface(output_surface.Pass());
     return;
   }
 
   if (!context_provider.get()) {
     if (compositor_thread_.get()) {
       LOG(FATAL) << "Failed to create UI context, but can't use software"
                  " compositing with browser threaded compositing. Aborting.";
     }
@@ skipping 117 matching lines @@
       BrowserGpuChannelHostFactory::instance()->GetGpuChannelId();
   return handle;
 }
 
 scoped_ptr<cc::SurfaceIdAllocator>
 GpuProcessTransportFactory::CreateSurfaceIdAllocator() {
   return make_scoped_ptr(
       new cc::SurfaceIdAllocator(next_surface_id_namespace_++));
 }
 
+void GpuProcessTransportFactory::ResizeDisplay(ui::Compositor* compositor,
+                                               const gfx::Size& size) {
+  PerCompositorDataMap::iterator it = per_compositor_data_.find(compositor);
+  if (it == per_compositor_data_.end())
+    return;
+  PerCompositorData* data = it->second;
+  DCHECK(data);
+  if (data->display_client)
+    data->display_client->display()->Resize(size);
+}
+
 cc::SurfaceManager* GpuProcessTransportFactory::GetSurfaceManager() {
   return surface_manager_.get();
 }
 
 GLHelper* GpuProcessTransportFactory::GetGLHelper() {
   if (!gl_helper_ && !per_compositor_data_.empty()) {
     scoped_refptr<cc::ContextProvider> provider =
         SharedMainThreadContextProvider();
     if (provider.get())
       gl_helper_.reset(new GLHelper(provider->ContextGL(),
@@ skipping 117 matching lines @@
   FOR_EACH_OBSERVER(ImageTransportFactoryObserver,
                     observer_list_,
                     OnLostResources());
 
   // Kill things that use the shared context before killing the shared context.
   lost_gl_helper.reset();
   lost_shared_main_thread_contexts  = NULL;
 }
 
 }  // namespace content