Added proper extension manifest parser for launcher_page.

extensions/common/manifest_handlers/launcher_page_info.h

Index: extensions/common/manifest_handlers/launcher_page_info.h
diff --git a/extensions/common/manifest_handlers/launcher_page_info.h b/extensions/common/manifest_handlers/launcher_page_info.h
new file mode 100644
index 0000000000000000000000000000000000000000..24ec94937079f29b632a635093831c2a24c48b8e
--- /dev/null
+++ b/extensions/common/manifest_handlers/launcher_page_info.h
@@ -0,0 +1,42 @@
+// 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 EXTENSIONS_COMMON_MANIFEST_HANDLERS_LAUNCHER_PAGE_INFO_H_
+#define EXTENSIONS_COMMON_MANIFEST_HANDLERS_LAUNCHER_PAGE_INFO_H_
+
+#include <string>
+#include <vector>
+
+#include "base/strings/string16.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/manifest_handler.h"
+
+namespace extensions {
+
+struct LauncherPageInfo : public Extension::ManifestData {
+  // The page URL.
+  std::string page;
+};
+
+// Parses the "launcher_page" manifest key.
+class LauncherPageHandler : public ManifestHandler {
+ public:
+  LauncherPageHandler();
+  virtual ~LauncherPageHandler();
+
+  // ManifestHandler overrides:
+  virtual bool Parse(Extension* extension, base::string16* error) OVERRIDE;
+  virtual bool Validate(const Extension* extension,
+                        std::string* error,
+                        std::vector<InstallWarning>* warnings) const OVERRIDE;
+
+ private:
+  virtual const std::vector<std::string> Keys() const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(LauncherPageHandler);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_MANIFEST_HANDLERS_LAUNCHER_PAGE_INFO_H_