Implement Blob.close().

Source/core/fileapi/File.h

Index: Source/core/fileapi/File.h
diff --git a/Source/core/fileapi/File.h b/Source/core/fileapi/File.h
index 6c5dd1a2c2acbdff87878de5491b3aae451a56e1..1b79ba88b9c077250e2b3f3e254f140cc17feead 100644
--- a/Source/core/fileapi/File.h
+++ b/Source/core/fileapi/File.h
@@ -32,6 +32,7 @@
 
 namespace WebCore {
 
+class ExecutionContext;
 struct FileMetadata;
 class KURL;
 
@@ -87,6 +88,7 @@ public:
 
     virtual unsigned long long size() const OVERRIDE;
     virtual PassRefPtr<Blob> slice(long long start = 0, long long end = std::numeric_limits<long long>::max(), const String& contentType = String()) const OVERRIDE;
+    virtual void close(ExecutionContext*) OVERRIDE;
 
     virtual bool isFile() const OVERRIDE { return true; }
     virtual bool hasBackingFile() const OVERRIDE { return m_hasBackingFile; }
@@ -94,9 +96,9 @@ public:
     virtual void appendTo(BlobData&) const OVERRIDE;
 
     const String& path() const { ASSERT(m_hasBackingFile); return m_path; }
-    const String& name() const { return m_name; }
+    const String name() const { return m_name; }
 
-    // This returns the current date and time if the file's last modifiecation date is not known (per spec: http://www.w3.org/TR/FileAPI/#dfn-lastModifiedDate).
+    // This returns the current date and time if the file's last modification date is not known (per spec: http://www.w3.org/TR/FileAPI/#dfn-lastModifiedDate).
     double lastModifiedDate() const;
 
     // Returns the relative path of this file in the context of a directory selection.
@@ -116,6 +118,8 @@ private:
     File(const String& name, const FileMetadata&);
     File(const KURL& fileSystemURL, const FileMetadata&);
 
+    void invalidateSnapshotMetadata() { m_snapshotSize = -1; }
+
     bool m_hasBackingFile;
     String m_path;
     String m_name;
@@ -124,7 +128,7 @@ private:
 
     // If m_snapshotSize is negative (initialized to -1 by default), the snapshot metadata is invalid and we retrieve the latest metadata synchronously in size(), lastModifiedTime() and slice().
     // Otherwise, the snapshot metadata are used directly in those methods.
-    const long long m_snapshotSize;
+    long long m_snapshotSize;
     const double m_snapshotModificationTime;
 
     String m_relativePath;