Add latency measurement system

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc

Index: content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
index 30982bb0a2b193ee006d17cfb5a976b8f1e2071a..bc42f937a379b0bb2413c8eb02ab6c499c5c4ec5 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
+++ b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
@@ -133,6 +133,7 @@ WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl(
       context_lost_reason_(GL_NO_ERROR),
       error_message_callback_(0),
       swapbuffers_complete_callback_(0),
+      latency_info_callback_(0),
       gpu_preference_(gfx::PreferIntegratedGpu),
       cached_width_(0),
       cached_height_(0),
@@ -235,6 +236,10 @@ bool WebGraphicsContext3DCommandBufferImpl::MaybeInitializeGL(
       base::Bind(&WebGraphicsContext3DCommandBufferImpl::OnErrorMessage,
                  weak_ptr_factory_.GetWeakPtr()));
 
+  command_buffer_->SetLatencyInfoCallback(
+      base::Bind(&WebGraphicsContext3DCommandBufferImpl::OnSetLatencyInfo,
+                 weak_ptr_factory_.GetWeakPtr()));
+
   client_error_message_callback_.reset(
       new WebGraphicsContext3DErrorMessageCallback(this));
   gl_->SetErrorMessageCallback(client_error_message_callback_.get());
@@ -551,6 +556,24 @@ void WebGraphicsContext3DCommandBufferImpl::postSubBufferCHROMIUM(
       weak_ptr_factory_.GetWeakPtr()));
 }
 
+void WebGraphicsContext3DCommandBufferImpl::setLatencyInfoCHROMIUM(
+    const WebKit::WebLatencyInfo& latency_info) {
+  command_buffer_->SetLatencyInfo(
+      static_cast<const WebKit::WebLatencyInfoImpl&>(latency_info));
+}
+
+void WebGraphicsContext3DCommandBufferImpl::setLatencyInfoCallbackCHROMIUM(
+    WebGraphicsContext3D::WebGraphicsLatencyInfoCallbackCHROMIUM* cb) {
+  latency_info_callback_ = cb;
+}
+
+void WebGraphicsContext3DCommandBufferImpl::OnSetLatencyInfo(
+    const WebKit::WebLatencyInfoImpl& latency_info) {
+  if (latency_info_callback_)
+    latency_info_callback_->onReceivedLatencyInfo(
+        static_cast<const WebKit::WebLatencyInfo&>(latency_info));
+}
+
 void WebGraphicsContext3DCommandBufferImpl::reshape(int width, int height) {
   cached_width_ = width;
   cached_height_ = height;