Mojo surfaces service and example app

cc/surfaces/display.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 "cc/surfaces/display.h"
 
 #include "base/debug/trace_event.h"
 #include "base/message_loop/message_loop.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 75 matching lines @@
     return false;
 
   scoped_ptr<CompositorFrame> frame =
       aggregator_->Aggregate(current_surface_id_);
   if (!frame)
     return false;
 
   TRACE_EVENT0("cc", "Display::Draw");
   DelegatedFrameData* frame_data = frame->delegated_frame_data.get();
 
+  // Only reshape when we know we are going to draw. Otherwise, the reshape
+  // can leave the window at the wrong size if we never draw and the proper
+  // viewport size is never set.
+  output_surface_->Reshape(current_surface_size_, 1.f);
   float device_scale_factor = 1.0f;
   gfx::Rect device_viewport_rect = gfx::Rect(current_surface_size_);
   gfx::Rect device_clip_rect = device_viewport_rect;
   bool disable_picture_quad_image_filtering = false;
 
   renderer_->DrawFrame(&frame_data->render_pass_list,
                        device_scale_factor,
                        device_viewport_rect,
                        device_clip_rect,
                        disable_picture_quad_image_filtering);
   CompositorFrameMetadata metadata;
   renderer_->SwapBuffers(metadata);
   return true;
 }
 
 SurfaceId Display::CurrentSurfaceId() {
   return current_surface_id_;
 }
 
 }  // namespace cc