Add SetFileSize() IPC for WebSQL.

content/child/blink_platform_impl.h

 // Copyright 2014 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_CHILD_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/threading/thread_local_storage.h"
 #include "base/timer/timer.h"
@@ skipping 42 matching lines @@
   virtual blink::WebFallbackThemeEngine* fallbackThemeEngine();
   virtual blink::Platform::FileHandle databaseOpenFile(
       const blink::WebString& vfs_file_name, int desired_flags);
   virtual int databaseDeleteFile(const blink::WebString& vfs_file_name,
                                  bool sync_dir);
   virtual long databaseGetFileAttributes(
       const blink::WebString& vfs_file_name);
   virtual long long databaseGetFileSize(const blink::WebString& vfs_file_name);
   virtual long long databaseGetSpaceAvailableForOrigin(
       const blink::WebString& origin_identifier);
+  virtual bool databaseSetFileSize(
+      const blink::WebString& vfs_file_name, long long size);

[michaeln, 2015/04/01 21:04:48]

i don't understand why this won't compile without having this method defined for
blink::Platform?

[Scott Hess - ex-Googler, 2015/04/01 22:42:20]

I was pretty sure it was?  Unfortunately my blink checkout is failing somewhere
else, so I can't tell you immediately where it was failing.

[Scott Hess - ex-Googler, 2015/04/01 23:28:23]

Sorry, the error doesn't come here, it's in a subclass:
../../content/renderer/renderer_blink_platform_impl.h:96:61: error:
[chromium-style] Overriding method must be marked with 'override' or 'final'.

My guess is that the warning system knows about the difference between
blink-side and Chromiun-side classes, and since the blink interface doesn't
define this method it complains.

   virtual blink::WebString signedPublicKeyAndChallengeString(
       unsigned key_size_index, const blink::WebString& challenge,
       const blink::WebURL& url);
   virtual size_t memoryUsageMB();
   virtual size_t actualMemoryUsageMB();
   virtual size_t physicalMemoryMB();
   virtual size_t virtualMemoryLimitMB();
   virtual size_t numberOfProcessors();
 
   virtual bool processMemorySizesInBytes(size_t* private_bytes,
@@ skipping 119 matching lines @@
   scoped_ptr<WebBluetoothImpl> bluetooth_;
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<NotificationDispatcher> notification_dispatcher_;
   scoped_refptr<PushDispatcher> push_dispatcher_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_