DevTools: disable NoGPUCaptureScreenshotTest.LargeScreenshot when sw compositing is not available

Bug: 1137291
Change-Id: Id9ae17cce017e977adac8d6fee3f2d265f6ad89a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468945
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816880}

content/browser/devtools/protocol/devtools_protocol_browsertest.cc

@@ -570,6 +570,9 @@ IN_PROC_BROWSER_TEST_F(CaptureScreenshotTest, CaptureScreenshotJpeg) {
   CaptureScreenshotAndCompareTo(expected_bitmap, ENCODING_JPEG, false);
 }
 
+// ChromeOS does not support software compositing.
+#if !defined(OS_CHROMEOS)
+
 class NoGPUCaptureScreenshotTest : public CaptureScreenshotTest {
   void SetUpCommandLine(base::CommandLine* command_line) override {
     CaptureScreenshotTest::SetUpCommandLine(command_line);
@@ -585,7 +588,12 @@ IN_PROC_BROWSER_TEST_F(NoGPUCaptureScreenshotTest, DISABLED_LargeScreenshot) {
   // TODO(eseckler): Reenable with error limit if necessary.
   if (base::SysInfo::IsLowEndDevice())
     return;
-
+  // If disabling software compositing is disabled by the test caller,
+  // we're out of luck.
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableSoftwareCompositingFallback)) {
+    return;
+  }
   shell()->LoadURL(
       GURL("data:text/html,"
            "<style>body,html { padding: 0; margin: 0; }</style>"
@@ -618,6 +626,8 @@ IN_PROC_BROWSER_TEST_F(NoGPUCaptureScreenshotTest, DISABLED_LargeScreenshot) {
   EXPECT_GT(static_cast<int>(SkColorGetB(bottom_left)), 128);
 }
 
+#endif  // !defined(OS_CHROMEOS)
+
 // Setting frame size (through RWHV) is not supported on Android.
 // This test seems to be very flaky on windows: https://crbug.com/801173
 #if defined(OS_ANDROID) || defined(OS_LINUX) || defined(OS_CHROMEOS) || \