Validate image files before writing them to media galleries.

webkit/fileapi/mock_file_system_context.cc

Index: webkit/fileapi/mock_file_system_context.cc
diff --git a/webkit/fileapi/mock_file_system_context.cc b/webkit/fileapi/mock_file_system_context.cc
index 39f90169bd7d79bb9e81170b9c3eed604516aeee..b83bdc9f091f2e50b19eaba1d505a13c32ada955 100644
--- a/webkit/fileapi/mock_file_system_context.cc
+++ b/webkit/fileapi/mock_file_system_context.cc
@@ -22,6 +22,14 @@ FileSystemContext* CreateFileSystemContextForTesting(
   additional_providers.push_back(
       new TestMountPointProvider(
           base::MessageLoopProxy::current(), base_path));
+  return CreateFileSystemContextWithAdditionalProvidersForTesting(
+      quota_manager_proxy, additional_providers.Pass(), base_path);
+}
+
+FileSystemContext* CreateFileSystemContextWithAdditionalProvidersForTesting(
+    quota::QuotaManagerProxy* quota_manager_proxy,
+    ScopedVector<FileSystemMountPointProvider> additional_providers,
+    const base::FilePath& base_path) {
   return new FileSystemContext(
       FileSystemTaskRunners::CreateMockTaskRunners(),
       ExternalMountPoints::CreateRefCounted().get(),