Revert 60421 - Revert 60373, trying to track down a perf regression (see bug 56752)- Add about:gpuhang

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/3447023

TBR=thakis@chromium.org
Review URL: http://codereview.chromium.org/3398027

TBR=thakis@chromium.org
Review URL: http://codereview.chromium.org/3398028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@60430 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 8 insertions, 0 deletions

diff --git a/chrome/gpu/gpu_thread.cc b/chrome/gpu/gpu_thread.cc
index 97cb5d1..cb2a89b 100644
--- a/chrome/gpu/gpu_thread.cc
+++ b/chrome/gpu/gpu_thread.cc
@@ -91,6 +91,8 @@ void GpuThread::OnControlMessageReceived(const IPC::Message& msg) {
                         OnCollectGraphicsInfo)
     IPC_MESSAGE_HANDLER(GpuMsg_Crash,
                         OnCrash)
+    IPC_MESSAGE_HANDLER(GpuMsg_Hang,
+                        OnHang)
   IPC_END_MESSAGE_MAP_EX()
 }
 
@@ -168,3 +170,8 @@ void GpuThread::OnCrash() {
   volatile int* it_s_the_end_of_the_world_as_we_know_it = NULL;
   *it_s_the_end_of_the_world_as_we_know_it = 0xdead;
 }
+
+void GpuThread::OnHang() {
+  for (;;)
+    PlatformThread::Sleep(1000);
+}
diff --git a/chrome/gpu/gpu_thread.h b/chrome/gpu/gpu_thread.h
index 519b092..b896360 100644
--- a/chrome/gpu/gpu_thread.h
+++ b/chrome/gpu/gpu_thread.h
@@ -43,6 +43,7 @@ class GpuThread : public ChildThread {
   void OnSynchronize();
   void OnCollectGraphicsInfo();
   void OnCrash();
+  void OnHang();
   void OnNewRenderWidgetHostView(GpuNativeWindowHandle parent_window,
                                  int32 routing_id);