Add GPU memory tab to the task manager.

content/browser/gpu/gpu_data_manager_impl.cc

Index: content/browser/gpu/gpu_data_manager_impl.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl.cc b/content/browser/gpu/gpu_data_manager_impl.cc
index 72a98cca0b1631cfaf6e80165bcfb04a73494d61..7a06f23ddafb851ca0cccaf8a3d6f11d8e31a4bc 100644
--- a/content/browser/gpu/gpu_data_manager_impl.cc
+++ b/content/browser/gpu/gpu_data_manager_impl.cc
@@ -114,6 +114,13 @@ content::GPUInfo GpuDataManagerImpl::GetGPUInfo() const {
   return gpu_info_;
 }
 
+void GpuDataManagerImpl::RequestVidmemUpdate() {
+  GpuProcessHost::SendOnIO(
+      GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
+      content::CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
+      new GpuMsg_GetVidmem());
+}
+
 void GpuDataManagerImpl::AddLogMessage(Value* msg) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   log_messages_.Append(msg);
@@ -273,6 +280,10 @@ void GpuDataManagerImpl::NotifyGpuInfoUpdate() {
   observer_list_->Notify(&GpuDataManagerObserver::OnGpuInfoUpdate);
 }
 
+void GpuDataManagerImpl::UpdateVidmem(const content::GPUVidmem& vidmem) {
+  observer_list_->Notify(&GpuDataManagerObserver::OnVidmemUpdate, vidmem);
+}
+
 void GpuDataManagerImpl::UpdateGpuFeatureType(
     GpuFeatureType embedder_feature_type) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));