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

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 25 matching lines @@
 
 const char kExtensionId[] = "ddchlicdkolnonkihahngkmmmjnjlkkf";
 
 class TabCaptureApiTest : public ExtensionApiTest {
  public:
   void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     // 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() {
     base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
         switches::kWhitelistedExtensionID, kExtensionId);
   }
 
  protected:
   void SimulateMouseClickInCurrentTab() {
     content::SimulateMouseClick(
@@ skipping 33 matching lines @@
 #endif
   }
 };
 
 // Tests API behaviors, including info queries, and constraints violations.
 IN_PROC_BROWSER_TEST_F(TabCaptureApiTest, ApiTests) {
   AddExtensionToCommandLineWhitelist();
   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()) {
     LOG(WARNING) << "Skipping this CPU-intensive test on this platform/build.";
     return;
   }
   AddExtensionToCommandLineWhitelist();
   ASSERT_TRUE(RunExtensionSubtest(
       "tab_capture", "end_to_end.html?method=local&colorDeviation=10"))
       << message_;
 }
 
 // Tests that video frames are captured, transported via WebRTC, and finally
 // received in a VIDEO element.  More allowance is provided for color deviation
 // because of the additional layers of video processing performed within
 // WebRTC.
 IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, EndToEndThroughWebRTC) {
   if (IsTooIntensiveForThisPlatform()) {
     LOG(WARNING) << "Skipping this CPU-intensive test on this platform/build.";
     return;
   }
   AddExtensionToCommandLineWhitelist();
   ASSERT_TRUE(RunExtensionSubtest(
       "tab_capture", "end_to_end.html?method=webrtc&colorDeviation=50"))
       << 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
 #else
 #define MAYBE_GetUserMediaTest GetUserMediaTest
 #endif
 // Tests that getUserMedia() is NOT a way to start tab capture.
 IN_PROC_BROWSER_TEST_F(TabCaptureApiTest, MAYBE_GetUserMediaTest) {
   ExtensionTestMessageListener listener("ready", true);
 
@@ skipping 220 matching lines @@
       return;
     }
     content::RunMessageLoop();
   }
   browser()->tab_strip_model()->RemoveObserver(&observer);
 }
 
 }  // namespace
 
 }  // namespace extensions