[Android WebView] OnMemoryPressure to drop tile memory

android_webview/native/aw_contents.h

 // Copyright (c) 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 ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_
 
 #include <jni.h>
 #include <list>
 #include <string>
@@ skipping 161 matching lines @@
   void SetFixedLayoutSize(JNIEnv* env,
                           jobject obj,
                           jint width_dip,
                           jint height_dip);
   void SetSaveFormData(bool enabled);
 
   // Sets the java delegate
   void SetAwAutofillManagerDelegate(jobject delegate);
 
   void SetJsOnlineProperty(JNIEnv* env, jobject obj, jboolean network_up);
+  void TrimMemory(JNIEnv* env, jobject obj, jint level);
 
  private:
   void InitAutofillIfNecessary(bool enabled);
   void SetAndroidWebViewRendererPrefs();
 
   JavaObjectWeakGlobalRef java_ref_;
   scoped_ptr<content::WebContents> web_contents_;
   scoped_ptr<AwWebContentsDelegate> web_contents_delegate_;
   scoped_ptr<AwContentsClientBridge> contents_client_bridge_;
   scoped_ptr<AwRenderViewHostExt> render_view_host_ext_;
@@ skipping 10 matching lines @@
   std::list<OriginCallback> pending_geolocation_prompts_;
 
   DISALLOW_COPY_AND_ASSIGN(AwContents);
 };
 
 bool RegisterAwContents(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_