add "did it run on GPU" check to frame_rate_tests.cc using AutomationProxy tracing feature

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 72477c029a9b28d3735ab5805f4a7eb109c37c8f..6e4cf10643a700062dfb54d5b98d46d77739b70c 100644
--- a/chrome/test/perf/frame_rate/frame_rate_tests.cc
+++ b/chrome/test/perf/frame_rate/frame_rate_tests.cc
@@ -4,6 +4,7 @@
 
 #include <map>
 
+#include "base/debug/trace_event_test_utils.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
@@ -11,6 +12,8 @@
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
+#include "chrome/test/automation/automation_proxy.h"
+#include "chrome/test/automation/browser_proxy.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/ui/javascript_test_util.h"
 #include "chrome/test/ui/ui_perf_test.h"
@@ -53,6 +56,9 @@ class FrameRateTest : public UIPerfTest {
   void RunTest(const std::string& name,
                const std::string& suffix,
                bool make_body_composited) {
+    using namespace base::debug;
+    using namespace base::debug::trace;
+
     FilePath test_path = GetDataPath(name);
     ASSERT_TRUE(file_util::DirectoryExists(test_path))
         << "Missing test directory: " << test_path.value();
@@ -70,6 +76,12 @@ class FrameRateTest : public UIPerfTest {
           GURL("javascript:__make_body_composited();")));
     }
 
+    // Create a browser proxy.
+    scoped_refptr<BrowserProxy> browser = automation()->GetBrowserWindow(0);
+
+    // Start tracing category "test_frame_rate_tests".
+    ASSERT_TRUE(browser->BeginTracing("test_frame_rate_tests"));
+
     // Start the tests.
     ASSERT_TRUE(tab->NavigateToURLAsync(GURL("javascript:__start_all();")));
 
@@ -78,6 +90,10 @@ class FrameRateTest : public UIPerfTest {
         tab, L"", L"window.domAutomationController.send(!__running_all);",
         TestTimeouts::large_test_timeout_ms()));
 
+    // Stop tracing.
+    std::string json_events;
+    ASSERT_TRUE(browser->EndTracing(&json_events));
+
     // Read out the results.
     std::wstring json;
     ASSERT_TRUE(tab->ExecuteAndExtractString(
@@ -95,7 +111,21 @@ class FrameRateTest : public UIPerfTest {
     ASSERT_TRUE(results.find("means") != results.end());
     ASSERT_TRUE(results.find("sigmas") != results.end());
 
-    std::string trace_name = "fps" + suffix;
+    // Check trace for GPU accleration.
+    TraceAnalyzer analyzer(json_events);
+    const TestTraceEvent* gpu_event =
+        analyzer.FindEvent(Query(EVENT_NAME) == "SwapBuffers" &&
+                           Query(EVENT_ARG, "is_GPU"));
+
+    // Verify that sanity-check DoDeferredUpdate event exists.
+    ASSERT_TRUE(analyzer.FindEvent(Query(EVENT_NAME) == "DoDeferredUpdate"));
+
+    // If GPU acceleration is requested, set the appropriate suffix. _swfb means
+    // software fallback (GPU acceleration requested but not available).
+    std::string gpu_suffix = gpu_event ? "_gpu" :
+                             make_body_composited ? "_swfb" : "";
+
+    std::string trace_name = "fps" + suffix + gpu_suffix;
     printf("GESTURES %s: %s= [%s] [%s] [%s]\n", name.c_str(),
                                                 trace_name.c_str(),
                                                 results["gestures"].c_str(),