Fixed the audio backgrounding bug

chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc

Index: chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
diff --git a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
index 24c58ef9a6acd950d566e73f5f62e0f5225ad8ed..e05767c5d7ee5e449a2d52bff2548999adfcffab 100644
--- a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
+++ b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
@@ -3,7 +3,9 @@
 // found in the LICENSE file.
 
 #include "base/command_line.h"
+#include "base/path_service.h"
 #include "base/process/process.h"
+#include "base/test/test_timeouts.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/search/search.h"
@@ -23,6 +25,8 @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/test/browser_test_utils.h"
+#include "net/base/filename_util.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
 
 using content::RenderViewHost;
 using content::RenderWidgetHost;
@@ -224,6 +228,62 @@ class ChromeRenderProcessHostTestWithCommandLine
   }
 };
 
+class ChromeRenderProcessHostBackgroundingTest
+    : public ChromeRenderProcessHostTest {
+ public:
+  ChromeRenderProcessHostBackgroundingTest() {}
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    command_line->AppendSwitch(switches::kProcessPerTab);
+  }
+
+  void SetUpOnMainThread() override {
+    ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
+
+    // Set up the server and get the test pages.
+    base::FilePath test_data_dir;
+    ASSERT_TRUE(PathService::Get(base::DIR_SOURCE_ROOT, &test_data_dir));
+    embedded_test_server()->ServeFilesFromDirectory(
+        test_data_dir.AppendASCII("chrome/test/data/"));
+    audio_url_ = embedded_test_server()->GetURL("/extensions/loop_audio.html");
+    no_audio_url_ = embedded_test_server()->GetURL("/title1.html");
+
+    // Open a browser, navigate to the audio page and get its WebContent.
+    ui_test_utils::NavigateToURL(browser(), audio_url_);
+    audio_tab_web_content_ =
+        browser()->tab_strip_model()->GetActiveWebContents();
+
+    // Get the process corresponding to the pages and create a new tab for the
+    // no audio page.
+    audio_process_ = ProcessFromHandle(
+        audio_tab_web_content_->GetRenderProcessHost()->GetHandle());
+    no_audio_process_ = ShowSingletonTab(no_audio_url_);
+
+    ASSERT_TRUE(no_audio_process_.IsValid());
+    ASSERT_TRUE(audio_process_.IsValid());
+    ASSERT_NE(audio_process_.Pid(), no_audio_process_.Pid());
+  }
+
+ protected:
+  bool IsProcessBackgroundedHelper(const base::Process& process) {
+#if defined(OS_MACOSX)
+    MachBroker* broker = MachBroker::GetInstance();
+    mach_port_t task_port = broker->TaskForPid(process.Pid());
+    return process.IsProcessBackgrounded(task_port);
+#else
+    return process.IsProcessBackgrounded();
+#endif  // defined(OS_MACOSX)
+  }
+
+  base::Process audio_process_;
+  base::Process no_audio_process_;
+
+  GURL audio_url_;
+  GURL no_audio_url_;
+
+  content::WebContents* audio_tab_web_content_;
+};
+
 // Disable on Mac and Windows due to ongoing flakiness. (crbug.com/442785)
 #if defined(OS_MACOSX) || defined(OS_WIN)
 #define MAYBE_ProcessPerTab DISABLED_ProcessPerTab
@@ -531,3 +591,95 @@ IN_PROC_BROWSER_TEST_F(ChromeRenderProcessHostTest,
 
   observer.Wait();
 }
+
+// Test to make sure that a process is backgrounded when the audio stops playing
+// from the active tab and there is an immediate tab switch.
+IN_PROC_BROWSER_TEST_F(ChromeRenderProcessHostBackgroundingTest,
+                       ProcessPriorityAfterStoppedAudio) {
+  // This test is invalid on platforms that can't background.
+  if (!base::Process::CanBackgroundProcesses())
+    return;
+
+  ShowSingletonTab(audio_url_);
+
+  // Wait until the no audio page is backgrounded and the audio page is not
+  // backgrounded.
+  while (!IsProcessBackgroundedHelper(no_audio_process_) ||
+         IsProcessBackgroundedHelper(audio_process_)) {
+    base::RunLoop().RunUntilIdle();
+    base::PlatformThread::Sleep(TestTimeouts::tiny_timeout());
+  }
+
+  // Pause the audio and immediately switch to the no audio tab.
+  content::ExecuteScript(audio_tab_web_content_,
+                         "document.getElementById('audioPlayer').pause();");
+  ShowSingletonTab(no_audio_url_);
+
+  // Wait until the no audio page is not backgrounded and the audio page is
+  // backgrounded.
+  while (IsProcessBackgroundedHelper(no_audio_process_) ||
+         !IsProcessBackgroundedHelper(audio_process_)) {
+    base::RunLoop().RunUntilIdle();
+    base::PlatformThread::Sleep(TestTimeouts::tiny_timeout());
+  }
+}
+
+// Test to make sure that a process is backgrounded automatically when audio
+// stops playing from a not visible tab.
+IN_PROC_BROWSER_TEST_F(ChromeRenderProcessHostBackgroundingTest,
+                       ProcessPriorityAfterAudioStopsOnNotVisibleTab) {
+  // This test is invalid on platforms that can't background.
+  if (!base::Process::CanBackgroundProcesses())
+    return;
+
+  // Wait until the two pages are not backgrounded.
+  while (IsProcessBackgroundedHelper(no_audio_process_) ||
+         IsProcessBackgroundedHelper(audio_process_)) {
+    base::RunLoop().RunUntilIdle();
+    base::PlatformThread::Sleep(TestTimeouts::tiny_timeout());
+  }
+
+  // Stop the audio.
+  content::ExecuteScript(audio_tab_web_content_,

[gab, 2015/08/18 01:48:05]

Need to ASSERT_TRUE on content::ExecuteScript.

This should fix compile errors: 
"ignoring return value of function declared with warn_unused_result attribute
[-Werror,-Wunused-result]
  content::ExecuteScript("

[sebsg, 2015/08/18 20:20:15]

Done.

+                         "document.getElementById('audioPlayer').pause();");
+
+  // Wait until the no audio page is not backgrounded and the audio page is
+  // backgrounded.
+  while (IsProcessBackgroundedHelper(no_audio_process_) ||
+         !IsProcessBackgroundedHelper(audio_process_)) {
+    base::RunLoop().RunUntilIdle();
+    base::PlatformThread::Sleep(TestTimeouts::tiny_timeout());
+  }
+}
+
+// Test to make sure that a process is un-backgrounded automatically when audio
+// starts playing from a backgrounded tab.
+IN_PROC_BROWSER_TEST_F(ChromeRenderProcessHostBackgroundingTest,
+                       ProcessPriorityAfterAudioStartsFromBackgroundTab) {
+  // This test is invalid on platforms that can't background.
+  if (!base::Process::CanBackgroundProcesses())
+    return;
+
+  // Stop the audio.
+  content::ExecuteScript(audio_tab_web_content_,
+                         "document.getElementById('audioPlayer').pause();");
+
+  // Wait until the no audio page is not backgrounded and the audio page is
+  // backgrounded.
+  while (IsProcessBackgroundedHelper(no_audio_process_) ||
+         !IsProcessBackgroundedHelper(audio_process_)) {
+    base::RunLoop().RunUntilIdle();
+    base::PlatformThread::Sleep(TestTimeouts::tiny_timeout());
+  }
+
+  // Start the audio from the backgrounded tab.
+  content::ExecuteScript(audio_tab_web_content_,
+                         "document.getElementById('audioPlayer').play();");
+
+  // Wait until the two pages are not backgrounded.
+  while (IsProcessBackgroundedHelper(no_audio_process_) ||
+         IsProcessBackgroundedHelper(audio_process_)) {
+    base::RunLoop().RunUntilIdle();
+    base::PlatformThread::Sleep(TestTimeouts::tiny_timeout());
+  }
+}