Introducing gpu::CommandBufferId as a distinct, IdType<...>-based type.

media/video/gpu_memory_buffer_video_frame_pool_unittest.cc

Index: media/video/gpu_memory_buffer_video_frame_pool_unittest.cc
diff --git a/media/video/gpu_memory_buffer_video_frame_pool_unittest.cc b/media/video/gpu_memory_buffer_video_frame_pool_unittest.cc
index 55dc9690a6de7205a41588134112b8dfc577a02c..b107e5d402212727b855dec1a4f5c1a87f99170e 100644
--- a/media/video/gpu_memory_buffer_video_frame_pool_unittest.cc
+++ b/media/video/gpu_memory_buffer_video_frame_pool_unittest.cc
@@ -36,8 +36,8 @@ class TestGLES2Interface : public gpu::gles2::GLES2InterfaceStub {
   void GenSyncTokenCHROMIUM(GLuint64 fence_sync, GLbyte* sync_token) override {
     gpu::SyncToken sync_token_data;
     if (fence_sync <= flushed_fence_sync_) {
-      sync_token_data.Set(gpu::CommandBufferNamespace::GPU_IO, 0, 0,
-                          fence_sync);
+      sync_token_data.Set(gpu::CommandBufferNamespace::GPU_IO, 0,
+                          gpu::CommandBufferId(), fence_sync);
       sync_token_data.SetVerifyFlush();
     }
     memcpy(sync_token, &sync_token_data, sizeof(sync_token_data));
@@ -47,8 +47,8 @@ class TestGLES2Interface : public gpu::gles2::GLES2InterfaceStub {
                                       GLbyte* sync_token) override {
     gpu::SyncToken sync_token_data;
     if (fence_sync <= flushed_fence_sync_) {
-      sync_token_data.Set(gpu::CommandBufferNamespace::GPU_IO, 0, 0,
-                          fence_sync);
+      sync_token_data.Set(gpu::CommandBufferNamespace::GPU_IO, 0,
+                          gpu::CommandBufferId(), fence_sync);
     }
     memcpy(sync_token, &sync_token_data, sizeof(sync_token_data));
   }