New tabCapture.captureOffscreenTab API, initially for Presentation API 1UA mode

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

Index: chrome/browser/extensions/api/tab_capture/tab_capture_apitest.cc
diff --git a/chrome/browser/extensions/api/tab_capture/tab_capture_apitest.cc b/chrome/browser/extensions/api/tab_capture/tab_capture_apitest.cc
index 06ae5b293dcda952ff52e9764908d5616ca542c2..aca04db44badced75f10d9ac91cc97b5749586a0 100644
--- a/chrome/browser/extensions/api/tab_capture/tab_capture_apitest.cc
+++ b/chrome/browser/extensions/api/tab_capture/tab_capture_apitest.cc
@@ -43,6 +43,8 @@ class TabCaptureApiTest : public ExtensionApiTest {
     // Specify smallish window size to make testing of tab capture less CPU
     // intensive.
     command_line->AppendSwitchASCII(::switches::kWindowSize, "300,300");
+    // Enable tabCapture.capturePresentation API for testing.
+    command_line->AppendSwitch(::switches::kEnableCapturePresentationApi);
   }
 
   void AddExtensionToCommandLineWhitelist() {
@@ -96,6 +98,14 @@ IN_PROC_BROWSER_TEST_F(TabCaptureApiTest, ApiTests) {
   ASSERT_TRUE(RunExtensionSubtest("tab_capture", "api_tests.html")) << message_;
 }
 
+// Tests that there is a maximum limitation to the number of simultaneous
+// offscreen presentation sessions.
+IN_PROC_BROWSER_TEST_F(TabCaptureApiTest, MaxOffscreenPresentations) {
+  AddExtensionToCommandLineWhitelist();
+  ASSERT_TRUE(RunExtensionSubtest("tab_capture", "max_presentations.html"))
+      << message_;
+}
+
 // Tests that tab capture video frames can be received in a VIDEO element.
 IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, EndToEndWithoutRemoting) {
   if (IsTooIntensiveForThisPlatform()) {
@@ -123,6 +133,19 @@ IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, EndToEndThroughWebRTC) {
       << message_;
 }
 
+// Tests that tab capture video frames can be received in a VIDEO element from
+// an offscreen presentation tab.
+IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, EndToEndOffscreenPresentation) {
+  if (IsTooIntensiveForThisPlatform()) {
+    LOG(WARNING) << "Skipping this CPU-intensive test on this platform/build.";
+    return;
+  }
+  AddExtensionToCommandLineWhitelist();
+  ASSERT_TRUE(RunExtensionSubtest(
+      "tab_capture", "presentation.html?colorDeviation=10"))
+      << message_;
+}
+
 // http://crbug.com/177163
 #if defined(OS_WIN) && !defined(NDEBUG)
 #define MAYBE_GetUserMediaTest DISABLED_GetUserMediaTest