Disable timestamps in WebGL.

third_party/WebKit/Source/modules/webgl/WebGLTimerQueryEXT.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/webgl/WebGLTimerQueryEXT.h"
 
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "modules/webgl/WebGLRenderingContextBase.h"
 #include "public/platform/Platform.h"
 
@@ skipping 39 matching lines @@
 {
     if (m_queryResultAvailable)
         return;
 
     if (!m_canUpdateAvailability)
         return;
 
     if (!hasTarget())
         return;
 
+    // If this is a timestamp query, set the result to 0 and make it available as we don't support timestamps in WebGL due to very poor driver support for them
+    if (m_target == GL_TIMESTAMP_EXT) {
+        m_queryResult = 0;
+        m_queryResultAvailable = true;
+        return;
+    }
+
     // We can only update the cached result when control returns to the browser.
     m_canUpdateAvailability = false;
     GLuint available = 0;
     gl->GetQueryObjectuivEXT(object(), GL_QUERY_RESULT_AVAILABLE_EXT, &available);
     m_queryResultAvailable = !!available;
     if (m_queryResultAvailable) {
         GLuint64 result = 0;
         gl->GetQueryObjectui64vEXT(object(), GL_QUERY_RESULT_EXT, &result);
         m_queryResult = result;
         unregisterTaskObserver();
@@ skipping 31 matching lines @@
         Platform::current()->currentThread()->removeTaskObserver(this);
     }
 }
 
 void WebGLTimerQueryEXT::didProcessTask()
 {
     m_canUpdateAvailability = true;
 }
 
 } // namespace blink