[Chromecast] Flag to use the same AudioManager as Chrome on Android

Use AudioManagerAndroid, instead of CastAudioManagerAndroid on ATV.

The flag should only be used for dev and testing.

Bug: internal b/160753974
Test: Turn on the flag and verify in the log
Change-Id: Ie205d3f48d40d85b67272eeb143dbbc99d22bfe8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311677Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790968}

chromecast/base/chromecast_switches.cc

@@ -212,6 +212,12 @@ const char kForceUpdateRemoteUrl[] = "force-update-remote-url";
 // means that dummy info will be used.
 const char kSysInfoFilePath[] = "sys-info-file-path";
 
+// Uses AudioManagerAndroid, instead of CastAudioManagerAndroid. This will
+// disable lots of Cast features, so it should only be used for development and
+// testing.
+const char kEnableChromeAudioManagerAndroid[] =
+    "enable-chrome-audio-manager-android";
+
 }  // namespace switches
 
 namespace chromecast {

chromecast/base/chromecast_switches.h

@@ -101,6 +101,8 @@ extern const char kForceUpdateRemoteUrl[];
 
 extern const char kSysInfoFilePath[];
 
+extern const char kEnableChromeAudioManagerAndroid[];
+
 }  // namespace switches
 
 namespace chromecast {

chromecast/browser/cast_content_browser_client.cc

@@ -104,6 +104,7 @@
 #include "chromecast/media/audio/cast_audio_manager_android.h"  //nogncheck
 #include "components/cdm/browser/cdm_message_filter_android.h"
 #include "components/crash/core/app/crashpad.h"
+#include "media/audio/android/audio_manager_android.h"
 #else
 #include "chromecast/browser/memory_pressure_controller_impl.h"
 #endif  // defined(OS_ANDROID)
@@ -276,6 +277,13 @@ CastContentBrowserClient::CreateAudioManager(
       ServiceConnector::MakeRemote(kBrowserProcessClientId),
       BUILDFLAG(ENABLE_CAST_AUDIO_MANAGER_MIXER));
 #elif defined(OS_ANDROID)
+  if (GetSwitchValueBoolean(switches::kEnableChromeAudioManagerAndroid,
+                            false)) {
+    LOG(INFO) << "Use AudioManagerAndroid instead of CastAudioManagerAndroid.";
+    return std::make_unique<::media::AudioManagerAndroid>(
+        std::move(audio_thread), audio_log_factory);
+  }
+
   return std::make_unique<media::CastAudioManagerAndroid>(
       std::move(audio_thread), audio_log_factory,
       base::BindRepeating(&CastContentBrowserClient::GetCmaBackendFactory,