Added support for Time Elapsed queries through the command buffer.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 6806f126eecfad57034b913e38a67c25c3fdfdf5..a776e83fc68da95d87c56737e7d2f08cf29f63a7 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -11591,7 +11591,9 @@ error::Error GLES2DecoderImpl::HandleBeginQueryEXT(uint32 immediate_data_size,
         return error::kNoError;
       }
       break;
-    default:
+    case GL_SAMPLES_PASSED:

[no sievers, 2015/06/23 21:45:27]

Good catch. Also, GL_SAMPLES_PASSED is actually not from
occlusion_query_boolean.

[David Yen, 2015/06/23 23:35:32]

We worked this out together, this should be okay.

+    case GL_ANY_SAMPLES_PASSED:
+    case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:

[no sievers, 2015/06/23 21:45:27]

@bajones: Do we support GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN yet w/the
experimental webgl2 stuff?
If we do looks like that would somehow oddly slip through the
AllSamplesPassedQuery in query_manager.cc.

[David Yen, 2015/06/23 23:35:32]

I talked this over with bajones, we do not support that query target.

       if (!features().occlusion_query_boolean) {
         LOCAL_SET_GL_ERROR(
             GL_INVALID_OPERATION, "glBeginQueryEXT",
@@ -11599,6 +11601,19 @@ error::Error GLES2DecoderImpl::HandleBeginQueryEXT(uint32 immediate_data_size,
         return error::kNoError;
       }
       break;
+    case GL_TIME_ELAPSED:
+      if (!query_manager_->GPUTimingAvailable()) {
+        LOCAL_SET_GL_ERROR(
+            GL_INVALID_OPERATION, "glBeginQueryEXT",
+            "not enabled for timing queries");
+        return error::kNoError;
+      }
+      break;
+    default:
+      LOCAL_SET_GL_ERROR(
+          GL_INVALID_OPERATION, "glBeginQueryEXT",
+          "unknown query target");
+      return error::kNoError;
   }
 
   if (state_.current_queries.find(target) != state_.current_queries.end()) {