cc: Made image comparison for pixel tests error tolerant.

cc/output/gl_renderer_pixeltest.cc

 // Copyright 2012 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/output/gl_renderer.h"
 
 #include "cc/layers/append_quads_data.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/test/pixel_test.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
@@ skipping 77 matching lines @@
   color_quad->SetNew(shared_state.get(), rect, SK_ColorGREEN);
 
   pass->quad_list.push_back(color_quad.PassAs<DrawQuad>());
 
   RenderPassList pass_list;
   pass_list.push_back(pass.Pass());
 
   renderer_->DrawFrame(&pass_list);
 
   EXPECT_TRUE(PixelsMatchReference(
-      base::FilePath(FILE_PATH_LITERAL("green.png")), true));
+      base::FilePath(FILE_PATH_LITERAL("green.png")),
+      ExactPixelComparator(true)));
 }
 
 TEST_F(GLRendererPixelTest, fastPassColorFilterAlpha) {
   gfx::Rect viewport_rect(device_viewport_size_);
 
   RenderPass::Id root_pass_id(1, 1);
   scoped_ptr<RenderPass> root_pass =
       CreateTestRootRenderPass(root_pass_id, viewport_rect);
 
   RenderPass::Id child_pass_id(2, 2);
@@ skipping 74 matching lines @@
 
   RenderPassList pass_list;
   pass_list.push_back(child_pass.Pass());
   pass_list.push_back(root_pass.Pass());
 
   renderer_->SetEnlargePassTextureAmountForTesting(gfx::Vector2d(50, 75));
   renderer_->DecideRenderPassAllocationsForFrame(pass_list);
   renderer_->DrawFrame(&pass_list);
 
   EXPECT_TRUE(PixelsMatchReference(
-      base::FilePath(FILE_PATH_LITERAL("blue_yellow_alpha.png")), false));
+      base::FilePath(FILE_PATH_LITERAL("blue_yellow_alpha.png")),
+      ExactPixelComparator(false)));
 }
 
 TEST_F(GLRendererPixelTest, fastPassColorFilterAlphaTranslation) {
   gfx::Rect viewport_rect(device_viewport_size_);
 
   RenderPass::Id root_pass_id(1, 1);
   scoped_ptr<RenderPass> root_pass =
       CreateTestRootRenderPass(root_pass_id, viewport_rect);
 
   RenderPass::Id child_pass_id(2, 2);
@@ skipping 79 matching lines @@
 
   pass_list.push_back(child_pass.Pass());
   pass_list.push_back(root_pass.Pass());
 
   renderer_->SetEnlargePassTextureAmountForTesting(gfx::Vector2d(50, 75));
   renderer_->DecideRenderPassAllocationsForFrame(pass_list);
   renderer_->DrawFrame(&pass_list);
 
   EXPECT_TRUE(PixelsMatchReference(
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_alpha_translate.png")),
-      false));
+      ExactPixelComparator(false)));
 }
 
 TEST_F(GLRendererPixelTest, RenderPassChangesSize) {
   gfx::Rect viewport_rect(device_viewport_size_);
 
   RenderPass::Id root_pass_id(1, 1);
   scoped_ptr<RenderPass> root_pass =
       CreateTestRootRenderPass(root_pass_id, viewport_rect);
 
   RenderPass::Id child_pass_id(2, 2);
@@ skipping 33 matching lines @@
 
   RenderPassList pass_list;
   pass_list.push_back(child_pass.Pass());
   pass_list.push_back(root_pass.Pass());
 
   renderer_->SetEnlargePassTextureAmountForTesting(gfx::Vector2d(50, 75));
   renderer_->DecideRenderPassAllocationsForFrame(pass_list);
   renderer_->DrawFrame(&pass_list);
 
   EXPECT_TRUE(PixelsMatchReference(
-      base::FilePath(FILE_PATH_LITERAL("blue_yellow.png")), true));
+      base::FilePath(FILE_PATH_LITERAL("blue_yellow.png")),
+      ExactPixelComparator(true)));
 }
 
 class GLRendererPixelTestWithBackgroundFilter : public GLRendererPixelTest {
  protected:
   void DrawFrame() {
     gfx::Rect device_viewport_rect(device_viewport_size_);
 
     RenderPass::Id root_id(1, 1);
     scoped_ptr<RenderPass> root_pass =
         CreateTestRootRenderPass(root_id, device_viewport_rect);
@@ skipping 106 matching lines @@
 
 TEST_F(GLRendererPixelTestWithBackgroundFilter, InvertFilter) {
   background_filters_.append(
       WebKit::WebFilterOperation::createInvertFilter(1.f));
 
   filter_pass_content_rect_ = gfx::Rect(device_viewport_size_);
   filter_pass_content_rect_.Inset(12, 14, 16, 18);
 
   DrawFrame();
   EXPECT_TRUE(PixelsMatchReference(
-      base::FilePath(FILE_PATH_LITERAL("background_filter.png")), true));
+      base::FilePath(FILE_PATH_LITERAL("background_filter.png")),
+      ExactPixelComparator(true)));
 }
 
 TEST_F(GLRendererPixelTest, AntiAliasing) {
   gfx::Rect rect(0, 0, 200, 200);
 
   RenderPass::Id id(1, 1);
   gfx::Transform transform_to_root;
   scoped_ptr<RenderPass> pass =
       CreateTestRenderPass(id, rect, transform_to_root);
 
@@ skipping 25 matching lines @@
   blue->SetNew(blue_shared_state.get(), rect, SK_ColorBLUE);
 
   pass->quad_list.push_back(blue.PassAs<DrawQuad>());
 
   RenderPassList pass_list;
   pass_list.push_back(pass.Pass());
 
   renderer_->DrawFrame(&pass_list);
 
   EXPECT_TRUE(PixelsMatchReference(
-      base::FilePath(FILE_PATH_LITERAL("anti_aliasing.png")), true));
+      base::FilePath(FILE_PATH_LITERAL("anti_aliasing.png")),
+      ExactPixelComparator(true)));
 }
 #endif
 
 }  // namespace
 }  // namespace cc