Add test running flag: --delay-test-start

src/tests/test_utils/ANGLETest.cpp

@@ -316,6 +316,7 @@ constexpr char kUseConfig[]                      = "--use-config=";
 constexpr char kReuseDisplays[]                  = "--reuse-displays";
 constexpr char kEnableANGLEPerTestCaptureLabel[] = "--angle-per-test-capture-label";
 constexpr char kBatchId[]                        = "--batch-id=";
+constexpr char kDelayTestStart[]                 = "--delay-test-start=";
 
 void SetupEnvironmentVarsForCaptureReplay()
 {
@@ -328,6 +329,18 @@ void SetupEnvironmentVarsForCaptureReplay()
 }
 }  // anonymous namespace
 
+int gTestStartDelaySeconds = 0;
+
+int GetTestStartDelaySeconds()
+{
+    return gTestStartDelaySeconds;
+}
+
+void SetTestStartDelay(const char *testStartDelay)
+{
+    gTestStartDelaySeconds = std::stoi(testStartDelay);
+}
+
 // static
 std::array<Vector3, 6> ANGLETestBase::GetQuadVertices()
 {
@@ -488,6 +501,12 @@ void ANGLETestBase::ANGLETestSetUp()
 {
     mSetUpCalled = true;
 
+    // Delay test startup to allow a debugger to attach.
+    if (GetTestStartDelaySeconds())
+    {
+        angle::Sleep(GetTestStartDelaySeconds() * 1000);
+    }
+
     gDefaultPlatformMethods.overrideWorkaroundsD3D = TestPlatform_overrideWorkaroundsD3D;
     gDefaultPlatformMethods.overrideFeaturesVk     = TestPlatform_overrideFeaturesVk;
     gDefaultPlatformMethods.logError               = TestPlatform_logError;
@@ -1396,5 +1415,9 @@ void ANGLEProcessTestArgs(int *argc, char *argv[])
         {
             gEnableANGLEPerTestCaptureLabel = true;
         }
+        else if (strncmp(argv[argIndex], kDelayTestStart, strlen(kDelayTestStart)) == 0)
+        {
+            SetTestStartDelay(argv[argIndex] + strlen(kDelayTestStart));
+        }
     }
 }