Link MediaSessionTabHelper with native MediaSession [CL is going to be split]

content/public/android/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 
 android_aidl("common_aidl") {
   interface_file = "java/src/org/chromium/content/common/common.aidl"
   import_include = "java/src"
@@ skipping 181 matching lines @@
     "java/src/org/chromium/content/common/FileDescriptorInfo.java",
     "java/src/org/chromium/content/common/SurfaceWrapper.java",
     "java/src/org/chromium/content_public/browser/AccessibilitySnapshotCallback.java",
     "java/src/org/chromium/content_public/browser/AccessibilitySnapshotNode.java",
     "java/src/org/chromium/content_public/browser/ContentBitmapCallback.java",
     "java/src/org/chromium/content_public/browser/GestureStateListener.java",
     "java/src/org/chromium/content_public/browser/ImageDownloadCallback.java",
     "java/src/org/chromium/content_public/browser/InterfaceRegistrar.java",
     "java/src/org/chromium/content_public/browser/JavaScriptCallback.java",
     "java/src/org/chromium/content_public/browser/LoadUrlParams.java",
+    "java/src/org/chromium/content_public/browser/MediaSessionDelegate.java",
     "java/src/org/chromium/content_public/browser/MessagePort.java",
     "java/src/org/chromium/content_public/browser/MessagePortService.java",
     "java/src/org/chromium/content_public/browser/NavigationController.java",
     "java/src/org/chromium/content_public/browser/NavigationEntry.java",
     "java/src/org/chromium/content_public/browser/NavigationHistory.java",
     "java/src/org/chromium/content_public/browser/WebContents.java",
     "java/src/org/chromium/content_public/browser/WebContentsObserver.java",
     "java/src/org/chromium/content_public/common/MediaMetadata.java",
     "java/src/org/chromium/content_public/common/Referrer.java",
     "java/src/org/chromium/content_public/common/ResourceRequestBody.java",
@@ skipping 102 matching lines @@
     "java/src/org/chromium/content/browser/SpeechRecognition.java",
     "java/src/org/chromium/content/browser/TracingControllerAndroid.java",
     "java/src/org/chromium/content/browser/accessibility/BrowserAccessibilityManager.java",
     "java/src/org/chromium/content/browser/framehost/NavigationControllerImpl.java",
     "java/src/org/chromium/content/browser/input/DateTimeChooserAndroid.java",
     "java/src/org/chromium/content/browser/input/HandleViewResources.java",
     "java/src/org/chromium/content/browser/input/ImeAdapter.java",
     "java/src/org/chromium/content/browser/webcontents/WebContentsImpl.java",
     "java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java",
     "java/src/org/chromium/content_public/browser/LoadUrlParams.java",
+    "java/src/org/chromium/content_public/browser/MediaSessionDelegate.java",
     "java/src/org/chromium/content_public/common/MediaMetadata.java",
     "java/src/org/chromium/content_public/common/ResourceRequestBody.java",
   ]
   jni_package = "content"
 }
 
 group("jni") {
   public_deps = [
     ":content_jni_headers",
     ":jar_jni",
@@ skipping 99 matching lines @@
     "junit/src/org/chromium/content/browser/input/ThreadedInputConnectionFactoryTest.java",
     "junit/src/org/chromium/content/browser/input/ThreadedInputConnectionTest.java",
     "junit/src/org/chromium/content/browser/BindingManagerImplTest.java",
   ]
   deps = [
     ":content_java",
     "//base:base_java",
     "//base:base_java_test_support",
   ]
 }