cc: Abstract the LayerTreeHost.

cc/trees/layer_tree_host_pixeltest_readback.cc

 // 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 "build/build_config.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/layers/texture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/test/fake_picture_layer.h"
@@ skipping 79 matching lines @@
     if (insert_copy_request_after_frame_count_ == 0) {
       Layer* const target =
           readback_target_ ? readback_target_ : layer_tree()->root_layer();
       target->RequestCopyOfOutput(CreateCopyOutputRequest());
     }
     PostSetNeedsCommitToMainThread();
   }
 
   void DidCommitAndDrawFrame() override {
     if (insert_copy_request_after_frame_count_ ==
-        layer_tree_host()->source_frame_number()) {
+        layer_tree_host()->SourceFrameNumber()) {
       Layer* const target =
           readback_target_ ? readback_target_ : layer_tree()->root_layer();
       target->RequestCopyOfOutput(CreateCopyOutputRequest());
     }
   }
 
   void ReadbackResultAsBitmap(std::unique_ptr<CopyOutputResult> result) {
     EXPECT_TRUE(task_runner_provider()->IsMainThread());
     EXPECT_TRUE(result->HasBitmap());
     result_bitmap_ = result->TakeBitmap();
@@ skipping 436 matching lines @@
                            READBACK_DEFAULT),
         ReadbackTestConfig(LayerTreeHostReadbackPixelTest::PIXEL_TEST_GL,
                            READBACK_DEFAULT),
         ReadbackTestConfig(LayerTreeHostReadbackPixelTest::PIXEL_TEST_GL,
                            READBACK_BITMAP)));
 
 }  // namespace
 }  // namespace cc
 
 #endif  // OS_ANDROID