Add flag to do a fast pass through perf tests.

src/tests/angle_perftests_main.cpp

@@ -9,8 +9,18 @@
 
 #include <gtest/gtest.h>
 
+extern bool g_OnlyOneRunFrame;
+
 int main(int argc, char **argv)
 {
+    for (int i = 0; i < argc; ++i)
+    {
+        if (strcmp("--one-frame-only", argv[i]) == 0)
+        {
+            g_OnlyOneRunFrame = true;
+        }
+    }
+
     testing::InitGoogleTest(&argc, argv);
     testing::AddGlobalTestEnvironment(new testing::Environment());
     int rt = RUN_ALL_TESTS();

src/tests/perf_tests/ANGLEPerfTest.cpp

@@ -27,6 +27,8 @@ void OverrideWorkaroundsD3D(angle::PlatformMethods *platform, angle::Workarounds
 }
 }  // namespace
 
+bool g_OnlyOneRunFrame = false;
+
 ANGLEPerfTest::ANGLEPerfTest(const std::string &name, const std::string &suffix)
     : mName(name),
       mSuffix(suffix),
@@ -58,7 +60,7 @@ void ANGLEPerfTest::run()
         {
             ++mNumStepsPerformed;
         }
-        if (mTimer->getElapsedTime() > mRunTimeSeconds)
+        if (mTimer->getElapsedTime() > mRunTimeSeconds || g_OnlyOneRunFrame)
         {
             mRunning = false;
         }

src/tests/perf_tests/ANGLEPerfTest.h

@@ -120,4 +120,6 @@ class ANGLERenderTest : public ANGLEPerfTest
     angle::PlatformMethods mPlatformMethods;
 };
 
+extern bool g_OnlyOneRunFrame;
+
 #endif // PERF_TESTS_ANGLE_PERF_TEST_H_