Added a unique command buffer ID for command buffers.

content/common/gpu/client/command_buffer_proxy_impl.cc

Index: content/common/gpu/client/command_buffer_proxy_impl.cc
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.cc b/content/common/gpu/client/command_buffer_proxy_impl.cc
index 53ce2d7ee543787639fe8e1d0d14af7e50d20764..17ecca2741cc2db4748c4f974cb56c5dacc27614 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.cc
+++ b/content/common/gpu/client/command_buffer_proxy_impl.cc
@@ -27,11 +27,20 @@
 
 namespace content {
 
+namespace {
+
+uint64_t CommandBufferProxyID(int channel_id, int32 route_id) {
+  return (static_cast<uint64_t>(channel_id) << 32) | route_id;
+}
+
+}  // namespace
+
 CommandBufferProxyImpl::CommandBufferProxyImpl(GpuChannelHost* channel,
                                                int32 route_id,
                                                int32 stream_id)
     : lock_(nullptr),
       channel_(channel),
+      command_buffer_id_(CommandBufferProxyID(channel->channel_id(), route_id)),
       route_id_(route_id),
       stream_id_(stream_id),
       flush_count_(0),
@@ -475,6 +484,14 @@ bool CommandBufferProxyImpl::IsGpuChannelLost() {
   return !channel_ || channel_->IsLost();
 }
 
+gpu::CommandBufferNamespace CommandBufferProxyImpl::GetNamespaceID() const {
+  return gpu::CommandBufferNamespace::GPU_IO;
+}
+
+uint64_t CommandBufferProxyImpl::GetCommandBufferID() const {
+  return command_buffer_id_;
+}
+
 uint32 CommandBufferProxyImpl::InsertSyncPoint() {
   CheckLock();
   if (last_state_.error != gpu::error::kNoError)