Add CommandLatencyQuery to the gpu command buffer

Increases query result size to be 64 bits.
Allows result to be used as input on the query begin.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11235012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@163683 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 662c21c7..3504c8c 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -8652,6 +8652,7 @@
 
   switch (target) {
     case GL_COMMANDS_ISSUED_CHROMIUM:
+    case GL_LATENCY_QUERY_CHROMIUM:
       break;
     default:
       if (!feature_info_->feature_flags().occlusion_query_boolean) {