Add observers for DIP scale change.

content/browser/android/content_view_core_impl.h

 // Copyright 2012 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.
 
 #ifndef CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 206 matching lines @@
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       jboolean enabled);
 
   long GetNativeImeAdapter(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& obj);
   void SetFocus(JNIEnv* env,
                 const base::android::JavaParamRef<jobject>& obj,
                 jboolean focused);
 
+  void SetDIPScale(JNIEnv* env,
+                   const base::android::JavaParamRef<jobject>& obj,
+                   jfloat dipScale,
+                   jboolean forceLayout);
+
   jint GetBackgroundColor(JNIEnv* env, jobject obj);
   void SetAllowJavascriptInterfacesInspection(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       jboolean allow);
   void AddJavascriptInterface(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       const base::android::JavaParamRef<jobject>& object,
       const base::android::JavaParamRef<jstring>& name,
@@ skipping 171 matching lines @@
   bool PullStart() override;
   void PullUpdate(float delta) override;
   void PullRelease(bool allow_refresh) override;
   void PullReset() override;
 
   // --------------------------------------------------------------------------
   // Other private methods and data
   // --------------------------------------------------------------------------
 
   void InitWebContents();
+  void ForceLayout();
 
   RenderWidgetHostViewAndroid* GetRenderWidgetHostViewAndroid() const;
 
   blink::WebGestureEvent MakeGestureEvent(blink::WebInputEvent::Type type,
                                           int64_t time_ms,
                                           float x,
                                           float y) const;
 
   gfx::Size GetViewportSizePix() const;
   int GetTopControlsHeightPix() const;
@@ skipping 18 matching lines @@
   ui::ViewAndroid view_;
 
   // Reference to the current WebContents used to determine how and what to
   // display in the ContentViewCore.
   WebContentsImpl* web_contents_;
 
   // Page scale factor.
   float page_scale_;
 
   // Device scale factor.
-  const float dpi_scale_;
+  float dpi_scale_;
 
   // Observer to notify of lifecyle changes.
   base::ObserverList<ContentViewCoreImplObserver> observer_list_;
 
   // The cache of device's current orientation set from Java side, this value
   // will be sent to Renderer once it is ready.
   int device_orientation_;
 
   bool accessibility_enabled_;
 
   // Manages injecting Java objects.
   scoped_refptr<GinJavaBridgeDispatcherHost> java_bridge_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentViewCoreImpl);
 };
 
 bool RegisterContentViewCore(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_