Disable MediaSession API for WebView

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index 3c91dc748dbc69bab0fe1a56e7ea1f998f0b004f..6697767ba704bdf9eb4f69d6678a0654eae17a16 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -112,6 +112,10 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   // Presentation API, see https://crbug.com/521319.
   cl->AppendSwitch(switches::kDisableRemotePlaybackAPI);
 
+  // WebView does not support MediaSession API since there's no UI for media
+  // metadata and controls.
+  cl->AppendSwitchASCII(switches::kDisableBlinkFeatures, "MediaSession");

[Torne, 2017/01/09 11:47:06]

I'm not too familiar with how command line manipulation works; is it safe to
call AppendSwitch for kDisableBlinkFeatures multiple times with different
values? Do they all take effect?

[Zhiqiang Zhang (Slow), 2017/01/09 14:29:21]

You are right, they will conflict.
Now I just follow how RemotePlayback and Presentation does.

+
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
   if (cl->GetSwitchValueASCII(switches::kProcessType).empty()) {
     // Browser process (no type specified).