Added support for EXTDisjointTimerQuery on the Blink side.

Source/modules/webgl/WebGLTimerQueryEXT.cpp

Index: Source/modules/webgl/WebGLTimerQueryEXT.cpp
diff --git a/Source/modules/webgl/WebGLTimerQueryEXT.cpp b/Source/modules/webgl/WebGLTimerQueryEXT.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e61cb6e066560f5ad98fc985db550eec99a4a468
--- /dev/null
+++ b/Source/modules/webgl/WebGLTimerQueryEXT.cpp
@@ -0,0 +1,38 @@
+// 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 "config.h"
+
+#include "modules/webgl/WebGLTimerQueryEXT.h"
+
+#include "modules/webgl/WebGLRenderingContextBase.h"
+
+namespace blink {
+
+WebGLTimerQueryEXT* WebGLTimerQueryEXT::create(WebGLRenderingContextBase* ctx)
+{
+    return new WebGLTimerQueryEXT(ctx);
+}
+
+WebGLTimerQueryEXT::~WebGLTimerQueryEXT()
+{
+    // See the comment in WebGLObject::detachAndDeleteObject().
+    detachAndDeleteObject();
+}
+
+WebGLTimerQueryEXT::WebGLTimerQueryEXT(WebGLRenderingContextBase* ctx)
+    : WebGLContextObject(ctx)
+    , m_target(0)
+    , m_queryId(0)
+{
+    m_queryId = context()->webContext()->createQueryEXT();
+}
+
+void WebGLTimerQueryEXT::deleteObjectImpl(WebGraphicsContext3D* context3d)
+{
+    context3d->deleteQueryEXT(m_queryId);
+    m_queryId = 0;
+}
+
+} // namespace blink