Fix cpplint errors in cc/(animation|input|layers|trees|test)/

cc/test/pixel_test.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 "cc/test/pixel_test.h"
 
 #include "base/path_service.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/output_surface.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/test/paths.h"
 #include "cc/test/pixel_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_implementation.h"
 #include "webkit/gpu/context_provider_in_process.h"
 #include "webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 namespace cc {
 
 class PixelTest::PixelTestRendererClient : public RendererClient {
  public:
-  PixelTestRendererClient(gfx::Size device_viewport_size)
+  explicit PixelTestRendererClient(gfx::Size device_viewport_size)
       : device_viewport_size_(device_viewport_size) {}
 
   // RendererClient implementation.
   virtual gfx::Size DeviceViewportSize() const OVERRIDE {
     return device_viewport_size_;
   }
   virtual const LayerTreeSettings& Settings() const OVERRIDE {
     return settings_;
   }
   virtual void DidLoseOutputSurface() OVERRIDE {}
@@ skipping 50 matching lines @@
                    device_viewport_rect.height());
   bitmap.allocPixels();
   unsigned char* pixels = static_cast<unsigned char*>(bitmap.getPixels());
   renderer_->GetFramebufferPixels(pixels, device_viewport_rect);
 
   base::FilePath test_data_dir;
   if (!PathService::Get(cc::DIR_TEST_DATA, &test_data_dir))
     return false;
 
   // To rebaseline:
-  //return WritePNGFile(bitmap, test_data_dir.Append(ref_file));
+  // return WritePNGFile(bitmap, test_data_dir.Append(ref_file));
 
   return IsSameAsPNGFile(bitmap, test_data_dir.Append(ref_file));
 }
 
 }  // namespace cc