Add a --no-finish option to the perf tests.

src/tests/perf_tests/ANGLEPerfTest.cpp

@@ -773,7 +773,8 @@ void ANGLERenderTest::startTest() {}
 
 void ANGLERenderTest::finishTest()
 {
-    if (mTestParams.eglParameters.deviceType != EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE)
+    if (mTestParams.eglParameters.deviceType != EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE &&
+        !gNoFinish)
     {
         glFinish();
     }

src/tests/perf_tests/ANGLEPerfTestArgs.cpp

@@ -21,6 +21,7 @@ const char *gScreenShotDir = nullptr;
 bool gVerboseLogging       = false;
 double gTestTimeSeconds    = 1.0;
 int gTestTrials            = 3;
+bool gNoFinish             = false;
 
 // Default to three warmup loops. There's no science to this. More than two loops was experimentally
 // helpful on a Windows NVIDIA setup when testing with Vulkan and native trace tests.
@@ -111,6 +112,10 @@ void ANGLEProcessPerfTestArgs(int *argc, char **argv)
             // Skip an additional argument.
             argIndex++;
         }
+        else if (strcmp("--no-finish", argv[argIndex]) == 0)
+        {
+            gNoFinish = true;
+        }
         else
         {
             argv[argcOutCount++] = argv[argIndex];

src/tests/perf_tests/ANGLEPerfTestArgs.h

@@ -23,6 +23,7 @@ extern bool gVerboseLogging;
 extern int gWarmupLoops;
 extern double gTestTimeSeconds;
 extern int gTestTrials;
+extern bool gNoFinish;
 
 inline bool OneFrame()
 {

src/tests/perf_tests/README.md

@@ -34,6 +34,7 @@ Several command-line arguments control how the tests run:
 * `--no-warmup`: Skip warming up the tests. Equivalent to `--warmup-steps 0`.
 * `--test-time`: Run each test trial in a fixed time. Defaults to 1 second.
 * `--trials`: Number of times to repeat testing. Defaults to 3.
+* `--no-finish`: Don't call glFinish after each test trial.
 
 For example, for an endless run with no warmup, run: