Added support for EXTDisjointTimerQuery on the Blink side.

public/platform/WebGraphicsContext3D.h

Index: public/platform/WebGraphicsContext3D.h
diff --git a/public/platform/WebGraphicsContext3D.h b/public/platform/WebGraphicsContext3D.h
index 0ecbba3f9dbd8eb976c5bbcfb7f9151f2a15ccd9..06629d03ab32e5883b52b2445a79b306b96fa09b 100644
--- a/public/platform/WebGraphicsContext3D.h
+++ b/public/platform/WebGraphicsContext3D.h
@@ -392,6 +392,10 @@ public:
     virtual void getQueryivEXT(WGC3Denum target, WGC3Denum pname, WGC3Dint* params) { }
     virtual void getQueryObjectuivEXT(WebGLId query, WGC3Denum pname, WGC3Duint* params) { }
 
+    // GL_EXT_disjoint_timer_query
+    virtual void queryCounterEXT(WebGLId query, WGC3Denum target) {}
+    virtual void getQueryObjectui64vEXT(WebGLId query, WGC3Denum pname, WGC3Duint64* params) {}
+
     // GL_CHROMIUM_bind_uniform_location
     virtual void bindUniformLocationCHROMIUM(WebGLId program, WGC3Dint location, const WGC3Dchar* uniform) { }