ozone: Directly provide size of active mode from HardwareDisplayController

ui/ozone/platform/dri/dri_surface.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 "ui/ozone/platform/dri/dri_surface.h"
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkSurface.h"
@@ skipping 40 matching lines @@
   SkImageInfo info = SkImageInfo::MakeN32(
       viewport_size.width(), viewport_size.height(), kOpaque_SkAlphaType);
   surface_ = skia::AdoptRef(SkSurface::NewRaster(info));
 
   HardwareDisplayController* controller = window_delegate_->GetController();
   if (!controller)
     return;
 
   // For the display buffers use the mode size since a |viewport_size| smaller
   // than the display size will not scanout.
-  gfx::Size mode_size(controller->get_mode().hdisplay,
-                      controller->get_mode().vdisplay);
   for (size_t i = 0; i < arraysize(buffers_); ++i)
-    buffers_[i] = AllocateBuffer(dri_, mode_size);
+    buffers_[i] = AllocateBuffer(dri_, controller->GetModeSize());
 }
 
 void DriSurface::PresentCanvas(const gfx::Rect& damage) {
   DCHECK(base::MessageLoopForUI::IsCurrent());
   DCHECK(buffers_[front_buffer_ ^ 1]);
 
   HardwareDisplayController* controller = window_delegate_->GetController();
   if (!controller)
     return;
 
@@ skipping 19 matching lines @@
   SkRect real_damage = RectToSkRect(UnionRects(damage, last_damage_));
 
   // Copy damage region.
   skia::RefPtr<SkImage> image = skia::AdoptRef(surface_->newImageSnapshot());
   image->draw(canvas, &real_damage, real_damage, NULL);
 
   last_damage_ = damage;
 }
 
 }  // namespace ui