Make it possible to change the viewport size

mojo/services/view_manager/display_manager.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 "mojo/services/view_manager/display_manager.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/surfaces/surfaces_type_converters.h"
@@ skipping 95 matching lines @@
     return;
   dirty_rect_.Union(root_relative_rect);
   if (!draw_timer_.IsRunning()) {
     draw_timer_.Start(
         FROM_HERE,
         base::TimeDelta(),
         base::Bind(&DisplayManager::Draw, base::Unretained(this)));
   }
 }
 
+void DisplayManager::SetViewportSize(const gfx::Size& size) {
+  native_viewport_->SetSize(Size::From(size));
+}
+
 void DisplayManager::OnCreatedNativeViewport(uint64_t native_viewport_id) {
 }
 
 void DisplayManager::OnSurfaceConnectionCreated(SurfacePtr surface,
                                                 uint32_t id_namespace) {
   surface_ = surface.Pass();
   surface_.set_client(this);
   surface_id_allocator_.reset(new cc::SurfaceIdAllocator(id_namespace));
   Draw();
 }
@@ skipping 37 matching lines @@
   surface_id_ = cc::SurfaceId();
   SchedulePaint(connection_manager_->root(), gfx::Rect(size_));
 }
 
 void DisplayManager::ReturnResources(Array<ReturnedResourcePtr> resources) {
   DCHECK_EQ(0u, resources.size());
 }
 
 }  // namespace service
 }  // namespace mojo