Have RenderWidgetHostViewAndroid own sync compositor

content/browser/web_contents/web_contents_android.cc

 // Copyright 2013 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 "content/browser/web_contents/web_contents_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/command_line.h"
@@ skipping 179 matching lines @@
 }
 
 // static
 bool WebContentsAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 WebContentsAndroid::WebContentsAndroid(WebContents* web_contents)
     : web_contents_(web_contents),
       navigation_controller_(&(web_contents->GetController())),
+      synchronous_compositor_client_(nullptr),
       weak_factory_(this) {
   g_allocated_web_contents_androids.Get().insert(this);
   JNIEnv* env = AttachCurrentThread();
   obj_.Reset(env,
              Java_WebContentsImpl_create(
                  env,
                  reinterpret_cast<intptr_t>(this),
                  navigation_controller_.GetJavaObject().obj()).obj());
   RendererPreferences* prefs = web_contents_->GetMutableRendererPrefs();
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
@@ skipping 336 matching lines @@
   web_contents_->StopMediaSession();
 }
 
 ScopedJavaLocalRef<jstring>  WebContentsAndroid::GetEncoding(
     JNIEnv* env, jobject obj) const {
   return base::android::ConvertUTF8ToJavaString(env,
                                                 web_contents_->GetEncoding());
 }
 
 }  // namespace content