Factor out ContentViewAndroidDelegate

device/power_save_blocker/power_save_blocker_android.cc

Index: device/power_save_blocker/power_save_blocker_android.cc
diff --git a/device/power_save_blocker/power_save_blocker_android.cc b/device/power_save_blocker/power_save_blocker_android.cc
index 252ff02d6f71d0bb83a032ed708a1e7d95227547..2742feced79856d0859634d9f34ae71c03a3d6c7 100644
--- a/device/power_save_blocker/power_save_blocker_android.cc
+++ b/device/power_save_blocker/power_save_blocker_android.cc
@@ -34,6 +34,8 @@ class PowerSaveBlocker::Delegate
 
   base::android::ScopedJavaGlobalRef<jobject> java_power_save_blocker_;
 
+  ui::ViewAndroid::ScopedAnchorView anchor_view_;

[boliu, 2016/07/25 22:15:26]

this is a new gc root, ie it will prevent the anchor view from being garbage
collected, probably not ok

+
   scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(Delegate);
@@ -52,22 +54,22 @@ PowerSaveBlocker::Delegate::~Delegate() {}
 void PowerSaveBlocker::Delegate::ApplyBlock() {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 
-  ScopedJavaLocalRef<jobject> obj(java_power_save_blocker_);
+  if (!view_android_)
+    return;
+  anchor_view_ = view_android_->AcquireAnchorView();
+  if (anchor_view_.is_null())
+    return;
   JNIEnv* env = AttachCurrentThread();
-  if (view_android_) {
-    Java_PowerSaveBlocker_applyBlock(
-        env, obj.obj(), view_android_->GetViewAndroidDelegate().obj());
-  }
+  ScopedJavaLocalRef<jobject> obj(java_power_save_blocker_);
+  Java_PowerSaveBlocker_applyBlock(env, obj.obj(), anchor_view_.view().obj());
 }
 
 void PowerSaveBlocker::Delegate::RemoveBlock() {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
   ScopedJavaLocalRef<jobject> obj(java_power_save_blocker_);
-  JNIEnv* env = AttachCurrentThread();
-  if (view_android_) {
-    Java_PowerSaveBlocker_removeBlock(
-        env, obj.obj(), view_android_->GetViewAndroidDelegate().obj());
-  }
+  Java_PowerSaveBlocker_removeBlock(AttachCurrentThread(), obj.obj());
+  if (!anchor_view_.is_null())
+    anchor_view_.Reset();
 }
 
 PowerSaveBlocker::PowerSaveBlocker(