Let PowerSaveBlocker manager anchor view in Java side

ui/android/view_android.cc

 // Copyright 2016 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 "ui/android/view_android.h"
 
 #include <algorithm>
 
 #include "base/android/jni_android.h"
 #include "cc/layers/layer.h"
@@ skipping 84 matching lines @@
     child->RemoveFromParent();
   child->parent_ = this;
 }
 
 void ViewAndroid::RemoveFromParent() {
   if (parent_)
     parent_->RemoveChild(this);
 }
 
 ViewAndroid::ScopedAnchorView ViewAndroid::AcquireAnchorView() {
-  ScopedJavaLocalRef<jobject> delegate(GetViewAndroidDelegate());
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> delegate = GetViewAndroidDelegate().get(env);
   if (delegate.is_null())
     return ViewAndroid::ScopedAnchorView();
 
-  JNIEnv* env = base::android::AttachCurrentThread();
   return ViewAndroid::ScopedAnchorView(
       env, Java_ViewAndroidDelegate_acquireView(env, delegate), delegate);
 }
 
 void ViewAndroid::SetAnchorRect(const JavaRef<jobject>& anchor,
                                 const gfx::RectF& bounds) {
   if (bounds.IsEmpty())
     return;
 
-  ScopedJavaLocalRef<jobject> delegate(GetViewAndroidDelegate());
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> delegate = GetViewAndroidDelegate().get(env);
   if (delegate.is_null())
     return;
 
   float scale = display::Screen::GetScreen()
       ->GetDisplayNearestWindow(this)
       .device_scale_factor();
   int left_margin = std::round(bounds.x() * scale);
   // TODO(jinsukkim): Move content_offset() to ViewAndroid, since it's
   //                  specific to a given web contents/render widget.
   int top_margin = std::round(
       (GetWindowAndroid()->content_offset().y() + bounds.y()) * scale);
-  JNIEnv* env = base::android::AttachCurrentThread();
   Java_ViewAndroidDelegate_setViewPosition(
       env, delegate, anchor, bounds.x(), bounds.y(), bounds.width(),
       bounds.height(), scale, left_margin, top_margin);
 }
 
 void ViewAndroid::RemoveChild(ViewAndroid* child) {
   DCHECK(child);
   DCHECK_EQ(child->parent_, this);
 
   std::list<ViewAndroid*>::iterator it =
       std::find(children_.begin(), children_.end(), child);
   DCHECK(it != children_.end());
   children_.erase(it);
   child->parent_ = nullptr;
 }
 
 WindowAndroid* ViewAndroid::GetWindowAndroid() const {
   return parent_ ? parent_->GetWindowAndroid() : nullptr;
 }
 
-const ScopedJavaLocalRef<jobject> ViewAndroid::GetViewAndroidDelegate()
+const JavaObjectWeakGlobalRef ViewAndroid::GetViewAndroidDelegate()
     const {
   JNIEnv* env = base::android::AttachCurrentThread();
-  const ScopedJavaLocalRef<jobject> delegate = delegate_.get(env);
+  ScopedJavaLocalRef<jobject> delegate = delegate_.get(env);
   if (!delegate.is_null())
-    return delegate;
+    return delegate_;
 
-  return parent_ ? parent_->GetViewAndroidDelegate() : delegate;
+  return parent_ ? parent_->GetViewAndroidDelegate() : delegate_;
 }
 
 cc::Layer* ViewAndroid::GetLayer() const {
   return layer_.get();
 }
 
 void ViewAndroid::SetLayer(scoped_refptr<cc::Layer> layer) {
   layer_ = layer;
 }
 
 void ViewAndroid::StartDragAndDrop(const JavaRef<jstring>& jtext,
                                    const JavaRef<jobject>& jimage) {
-  ScopedJavaLocalRef<jobject> delegate(GetViewAndroidDelegate());
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> delegate = delegate_.get(env);
   if (delegate.is_null())
     return;
-  JNIEnv* env = base::android::AttachCurrentThread();
   Java_ViewAndroidDelegate_startDragAndDrop(env, delegate, jtext, jimage);
 }
 
 }  // namespace ui