fileSystemProvider: First cut at implementing fileSystemProvider API

chrome/renderer/extensions/file_system_natives.cc

Index: chrome/renderer/extensions/file_system_natives.cc
diff --git a/chrome/renderer/extensions/file_system_natives.cc b/chrome/renderer/extensions/file_system_natives.cc
index 522d1ca97b5e541539f051167bdaa962e542de3b..e7943ca72681f71af2cce0edf6782ae42f119844 100644
--- a/chrome/renderer/extensions/file_system_natives.cc
+++ b/chrome/renderer/extensions/file_system_natives.cc
@@ -16,6 +16,7 @@
 #include "third_party/WebKit/public/platform/WebFileSystem.h"
 #include "third_party/WebKit/public/platform/WebFileSystemType.h"
 #include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/web/WebDOMError.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "webkit/common/fileapi/file_system_types.h"
 #include "webkit/common/fileapi/file_system_util.h"
@@ -32,6 +33,9 @@ FileSystemNatives::FileSystemNatives(ChromeV8Context* context)
   RouteFunction("CrackIsolatedFileSystemName",
       base::Bind(&FileSystemNatives::CrackIsolatedFileSystemName,
                  base::Unretained(this)));
+  RouteFunction("GetDOMError",
+      base::Bind(&FileSystemNatives::GetDOMError,
+                 base::Unretained(this)));
 }
 
 void FileSystemNatives::GetIsolatedFileSystem(
@@ -117,4 +121,33 @@ void FileSystemNatives::CrackIsolatedFileSystemName(
       v8::String::New(filesystem_id.c_str(), filesystem_id.size()));
 }
 
+void FileSystemNatives::GetDOMError(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() != 2) {
+    NOTREACHED();
+    return;
+  }
+  if (!args[0]->IsString()) {
+    NOTREACHED();
+    return;
+  }
+  if (!args[1]->IsString()) {
+    NOTREACHED();
+    return;
+  }
+
+  std::string name(*v8::String::Utf8Value(args[0]));
+  if (name.empty()) {
+    NOTREACHED();
+    return;
+  }
+  std::string message(*v8::String::Utf8Value(args[1]));
+  // message is optional hence empty is fine.
+
+  blink::WebDOMError dom_error = blink::WebDOMError::create(
+      blink::WebString::fromUTF8(name),
+      blink::WebString::fromUTF8(message));
+  args.GetReturnValue().Set(dom_error.toV8Value());
+}
+
 }  // namespace extensions