[Android WebView] Implement WebSettings.{get|set}CacheMode

android_webview/browser/aw_contents_io_thread_client.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_BROWSER_AW_CONTENTS_IO_THREAD_CLIENT_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_IO_THREAD_CLIENT_H_
 
 #include "base/memory/scoped_ptr.h"
 
 class GURL;
@@ skipping 16 matching lines @@
 // Java-side instance. It is preferable to use the static getter methods to
 // obtain a new instance of the class rather than holding on to one for
 // prolonged periods of time (see note for more details).
 //
 // Note: The native AwContentsIoThreadClient instance has a Global ref to
 // the Java object. By keeping the native AwContentsIoThreadClient
 // instance alive you're also prolonging the lifetime of the Java instance, so
 // don't keep a AwContentsIoThreadClient if you don't need to.
 class AwContentsIoThreadClient {
  public:
+  // Corresponds to WebSettings cache mode constants.
+  enum CacheMode {
+    LOAD_DEFAULT = -1,
+    LOAD_NORMAL = 0,
+    LOAD_CACHE_ELSE_NETWORK = 1,
+    LOAD_NO_CACHE = 2,
+    LOAD_CACHE_ONLY = 3,
+  };
+
   virtual ~AwContentsIoThreadClient() {}
 
+  // Retrieve CacheMode setting value of this AwContents.
+  // This method is called on the IO thread only.
+  virtual CacheMode GetCacheMode() const = 0;
+
   // This will attempt to fetch the AwContentsIoThreadClient for the given
   // |render_process_id|, |render_view_id| pair.
   // This method can be called from any thread.
   // An empty scoped_ptr is a valid return value.
   static scoped_ptr<AwContentsIoThreadClient> FromID(int render_process_id,
                                                      int render_view_id);
 
   // This method is called on the IO thread only.
   virtual scoped_ptr<InterceptedRequestData> ShouldInterceptRequest(
       const GURL& location,
       const net::URLRequest* request) = 0;
 
   // Retrieve the AllowContentAccess setting value of this AwContents.
   // This method is called on the IO thread only.
   virtual bool ShouldBlockContentUrls() const = 0;
 
   // Retrieve the AllowFileAccess setting value of this AwContents.
   // This method is called on the IO thread only.
   virtual bool ShouldBlockFileUrls() const = 0;
 
   // Retrieve the BlockNetworkLoads setting value of this AwContents.
   // This method is called on the IO thread only.
   virtual bool ShouldBlockNetworkLoads() const = 0;
 };
 
 } // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_IO_THREAD_CLIENT_H_