Add signalSyncPoint to the WebGraphicsContext3D command buffer impls.

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/resources/sync_point_helper.h"
 #include "cc/test/pixel_test.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "third_party/skia/include/core/SkMatrix.h"
 #include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
 #include "third_party/skia/include/effects/SkColorMatrixFilter.h"
 
 namespace cc {
 namespace {
 
 class GLRendererPixelTest : public PixelTest {};
@@ skipping 498 matching lines @@
 
   RenderPassList pass_list;
   pass_list.push_back(pass.Pass());
 
   renderer_->DrawFrame(&pass_list);
 
   EXPECT_TRUE(PixelsMatchReference(
       base::FilePath(FILE_PATH_LITERAL("anti_aliasing.png")),
       ExactPixelComparator(true)));
 }
+
+static void SyncPointCallback(int* callback_count) {
+  ++(*callback_count);
+}
+
+TEST_F(GLRendererPixelTest, SignalSyncPoint) {
+  int callback_count = 0;
+  scoped_ptr<SyncPointHelper> helper = SyncPointHelper::SignalSyncPoint(
+      output_surface_->context3d(),
+      output_surface_->context3d()->insertSyncPoint(),
+      base::Bind(&SyncPointCallback, &callback_count));
+  output_surface_->context3d()->finish();
+  EXPECT_EQ(1, callback_count);
+}
 #endif
 
 }  // namespace
 }  // namespace cc