Fix UpdateTilePriorities viewport in Android WebView.

cc/test/pixel_test.h

 // Copyright 2013 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 "base/file_util.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/software_renderer.h"
 #include "cc/quads/render_pass.h"
 #include "cc/test/pixel_comparator.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 37 matching lines @@
   scoped_ptr<ResourceProvider> resource_provider_;
   scoped_ptr<PixelTestRendererClient> fake_client_;
   scoped_ptr<DirectRenderer> renderer_;
   scoped_ptr<SkBitmap> result_bitmap_;
 
   void SetUpGLRenderer(bool use_skia_gpu_backend);
   void SetUpSoftwareRenderer();
 
   void ForceExpandedViewport(gfx::Size surface_expansion,
                              gfx::Vector2d viewport_offset);
+  void ForceDeviceClip(gfx::Rect clip);
   void EnableExternalStencilTest();
 
  private:
   void ReadbackResult(base::Closure quit_run_loop,
                       scoped_ptr<CopyOutputResult> result);
 
   bool PixelsMatchReference(const base::FilePath& ref_file,
                             const PixelComparator& comparator);
 };
 
@@ skipping 136 matching lines @@
 }
 
 typedef RendererPixelTest<GLRenderer> GLRendererPixelTest;
 typedef RendererPixelTest<GLRendererWithSkiaGPUBackend>
     GLRendererSkiaGPUBackendPixelTest;
 typedef RendererPixelTest<SoftwareRenderer> SoftwareRendererPixelTest;
 
 }  // namespace cc
 
 #endif  // CC_TEST_PIXEL_TEST_H_