Add some TraceAnalyzer utility methods to simplify test code

chrome/test/perf/frame_rate/frame_rate_tests.cc

Index: chrome/test/perf/frame_rate/frame_rate_tests.cc
diff --git a/chrome/test/perf/frame_rate/frame_rate_tests.cc b/chrome/test/perf/frame_rate/frame_rate_tests.cc
index 865bc927f8620869fd54783de943270a74b6d7dd..4dfdc96b71601deac3ab0e23ca6265cd48a207f8 100644
--- a/chrome/test/perf/frame_rate/frame_rate_tests.cc
+++ b/chrome/test/perf/frame_rate/frame_rate_tests.cc
@@ -125,8 +125,8 @@ class FrameRateTest
     scoped_ptr<TraceAnalyzer> analyzer(TraceAnalyzer::Create(json_events));
 
     gfx::GLImplementation gl_impl = gfx::kGLImplementationNone;
-    const trace_analyzer::TraceEvent* gpu_event = analyzer->FindOneEvent(
-        Query::EventName() == Query::String("SwapBuffers") &&
+    const trace_analyzer::TraceEvent* gpu_event = analyzer->FindFirstOf(
+        Query::EventNameIs("SwapBuffers") &&
         Query::EventHasNumberArg("GLImpl"));
     if (gpu_event)
       gl_impl = static_cast<gfx::GLImplementation>(