Update TabCapturePerformanceTest to more accurately time captures.

chrome/browser/extensions/api/tab_capture/tab_capture_performancetest.cc

 // Copyright 2013 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/basictypes.h"
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/trace_event_analyzer.h"
 #include "base/win/windows_version.h"
 #include "chrome/browser/extensions/extension_apitest.h"
@@ skipping 187 matching lines @@
     bool gpu_frames = PrintResults(
         analyzer.get(),
         test_name,
         "RenderWidget::didCommitAndDrawCompositorFrame",
         "ms");
     EXPECT_TRUE(gpu_frames);
 
     // This prints out the average time between capture events.
     // As the capture frame rate is capped at 30fps, this score
     // cannot get any better than (lower) 33.33 ms.
+    // TODO(ericrk): Remove the "Capture" result once we are confident that
+    // "CaptureSucceeded" is giving the coverage we want. crbug.com/489817
     EXPECT_TRUE(PrintResults(analyzer.get(),
                              test_name,
                              "Capture",
                              "ms"));
+
+    // Also track the CaptureSucceeded event. Capture only indicates that a
+    // capture was requested, but this capture may later be aborted without
+    // running. CaptureSucceeded tracks successful frame captures.
+    EXPECT_TRUE(
+        PrintResults(analyzer.get(), test_name, "CaptureSucceeded", "ms"));
   }
 };
 
 }  // namespace
 
 IN_PROC_BROWSER_TEST_P(TabCapturePerformanceTest, Performance) {
   RunTest("TabCapturePerformance");
 }
 
 // Note: First argument is optional and intentionally left blank.
@@ skipping 25 matching lines @@
     TabCapturePerformanceTest,
     testing::Values(
         kScalingTestBase | kScaleQualityFast,
         kScalingTestBase | kScaleQualityGood,
         kScalingTestBase | kScaleQualityBest,
         kScalingTestBase | kScaleQualityFast | kSmallWindow,
         kScalingTestBase | kScaleQualityGood | kSmallWindow,
         kScalingTestBase | kScaleQualityBest | kSmallWindow));
 
 #endif  // USE_AURA