Add unit test for GL_CHROMIUM_sync_query

gpu/command_buffer/tests/gl_query_unittest.cc

Index: gpu/command_buffer/tests/gl_query_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_query_unittest.cc b/gpu/command_buffer/tests/gl_query_unittest.cc
index 9a8948fa15478301223fcf3bcc9e9581cc8c22ac..c025d2ac9a4ce53080c3285cf805fdb5e276c59a 100644
--- a/gpu/command_buffer/tests/gl_query_unittest.cc
+++ b/gpu/command_buffer/tests/gl_query_unittest.cc
@@ -150,6 +150,26 @@ TEST_F(QueryTest, DISABLED_LatencyQueryBasic) {
   EXPECT_LE(query_result, kTimePrecisionMicroseconds);
 }
 
+TEST_F(QueryTest, CommandsCompleted) {
+  if (!GLTestHelper::HasExtension("GL_CHROMIUM_sync_query")) {
+    LOG(INFO) << "GL_CHROMIUM_sync_query not supported. Skipping test...";
+    return;
+  }
+
+  GLuint query;
+  glGenQueriesEXT(1, &query);
+  glBeginQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM, query);
+  glClearColor(0.0, 0.0, 1.0, 1.0);
+  glClear(GL_COLOR_BUFFER_BIT);
+  glEndQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM);
+  glFlush();
+  unsigned int result = 0;

[reveman, 2014/05/28 00:03:00]

nit: GLuint

+  glGetQueryObjectuivEXT(query, GL_QUERY_RESULT_EXT, &result);
+  EXPECT_EQ(0U, result);

[reveman, 2014/05/28 00:03:00]

nit: 0u

+  glDeleteQueriesEXT(1, &query);
+  GLTestHelper::CheckGLError("no errors", __LINE__);
+}
+
 }  // namespace gpu