OffscreenPreRaster and its plumbings

android_webview/native/aw_settings.cc

 // Copyright (c) 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 "android_webview/native/aw_settings.h"
 
 #include "android_webview/browser/renderer_host/aw_render_view_host_ext.h"
 #include "android_webview/common/aw_content_client.h"
 #include "android_webview/native/aw_contents.h"
 #include "base/android/jni_android.h"
@@ skipping 191 matching lines @@
   if (video_overlay != prefs->use_video_overlay_for_embedded_encrypted_video) {
     prefs->use_video_overlay_for_embedded_encrypted_video = video_overlay;
     update_prefs = true;
   }
 
   content::RenderViewHost* host = web_contents()->GetRenderViewHost();
   if (update_prefs && host)
     host->SyncRendererPrefs();
 }
 
+void AwSettings::UpdateOffscreenPreRasterLocked(JNIEnv* env,
+                                                jobject obj,
+                                                jboolean enabled) {
+  AwContents* contents = AwContents::FromWebContents(web_contents());
+  if (contents) {
+    contents->SetOffscreenPreRaster(enabled);

[boliu, 2015/02/21 00:03:00]

This breaks the existing pattern that native reads the state from java (instead
of passing it in the post task). So add a @CalledByNative
getOffscreenPreRasterLocked here and use that here.

Then call this method from UpdateEverythingLocked

(I believe this is all to support using the setting object without binding to a
thread as the UI thread)

[hush (inactive), 2015/02/21 00:27:03]

Done.

+  }
+}
+
 void AwSettings::RenderViewCreated(content::RenderViewHost* render_view_host) {
   // A single WebContents can normally have 0 to many RenderViewHost instances
   // associated with it.
   // This is important since there is only one RenderViewHostExt instance per
   // WebContents (and not one RVHExt per RVH, as you might expect) and updating
   // settings via RVHExt only ever updates the 'current' RVH.
   // In android_webview we don't swap out the RVH on cross-site navigations, so
   // we shouldn't have to deal with the multiple RVH per WebContents case. That
   // in turn means that the newly created RVH is always the 'current' RVH
   // (since we only ever go from 0 to 1 RVH instances) and hence the DCHECK.
@@ skipping 195 matching lines @@
 
 static jstring GetDefaultUserAgent(JNIEnv* env, jclass clazz) {
   return base::android::ConvertUTF8ToJavaString(env, GetUserAgent()).Release();
 }
 
 bool RegisterAwSettings(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview