Add SetFileSize() IPC for WebSQL.

content/child/blink_platform_impl.h

Index: content/child/blink_platform_impl.h
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index f4957396605b51eb98c747ed96d9bdbb8998f6bc..1b0e71233f10e396f669a6ccf83980314352cbe8 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -60,6 +60,8 @@ class CONTENT_EXPORT BlinkPlatformImpl
   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);