Add some TraceAnalyzer utility methods to simplify test code

chrome/test/perf/rendering/throughput_tests.cc

 // Copyright (c) 2012 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 "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
@@ skipping 323 matching lines @@
     LOG(INFO) << "Spinning up test...";
     ASSERT_TRUE(tracing::BeginTracing("test_gpu"));
     Wait(spinup_time_ms_);
     ASSERT_TRUE(tracing::EndTracing(&json_events));
 
     // Wait for a pixel color to change (if requested).
     WaitForPixelColor();
 
     // Check if GPU is rendering:
     analyzer.reset(TraceAnalyzer::Create(json_events));
-    bool ran_on_gpu = (analyzer->FindEvents(Query::EventName() ==
-        Query::String("SwapBuffers"), &events_gpu) > 0u);
+    bool ran_on_gpu = (analyzer->FindEvents(
+        Query::EventNameIs("SwapBuffers"), &events_gpu) > 0u);
     LOG(INFO) << "Mode: " << (ran_on_gpu ? "GPU" : "Software");
     EXPECT_EQ(use_gpu_, ran_on_gpu);
 
     // Let the test run for a while.
     LOG(INFO) << "Running test...";
     ASSERT_TRUE(tracing::BeginTracing("test_fps"));
     Wait(run_time_ms_);
     ASSERT_TRUE(tracing::EndTracing(&json_events));
 
     // Search for frame ticks. We look for both SW and GPU frame ticks so that
     // the test can verify that only one or the other are found.
     analyzer.reset(TraceAnalyzer::Create(json_events));
-    Query query_sw = Query::EventName() == Query::String("TestFrameTickSW");
-    Query query_gpu = Query::EventName() == Query::String("TestFrameTickGPU");
+    Query query_sw = Query::EventNameIs("TestFrameTickSW");
+    Query query_gpu = Query::EventNameIs("TestFrameTickGPU");
     analyzer->FindEvents(query_sw, &events_sw);
     analyzer->FindEvents(query_gpu, &events_gpu);
     TraceEventVector* frames = NULL;
     if (use_gpu_) {
       frames = &events_gpu;
       EXPECT_EQ(0u, events_sw.size());
     } else {
       frames = &events_sw;
       EXPECT_EQ(0u, events_gpu.size());
     }
@@ skipping 217 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(ThroughputTestGPU, CanvasManyImagesGPU) {
   RunCanvasBenchTest("many_images", kNone | kIsGpuCanvasTest);
 }
 
 IN_PROC_BROWSER_TEST_F(ThroughputTestThread, CanvasManyImagesGPU) {
   RunCanvasBenchTest("many_images", kNone | kIsGpuCanvasTest);
 }
 
 }  // namespace