Adds a webstorePrivate method for silently installing extensions.

chrome/browser/extensions/extension_webstore_private_api.h

Index: chrome/browser/extensions/extension_webstore_private_api.h
diff --git a/chrome/browser/extensions/extension_webstore_private_api.h b/chrome/browser/extensions/extension_webstore_private_api.h
index f1021e1955e74bb6f33b3b5b862f9fd80143f315..90625e3b6e44cb0b2ca02d98695c9fd07d87313f 100644
--- a/chrome/browser/extensions/extension_webstore_private_api.h
+++ b/chrome/browser/extensions/extension_webstore_private_api.h
@@ -27,6 +27,9 @@ class WebstorePrivateApi {
   // Allows you to override the WebstoreInstaller delegate for testing.
   static void SetWebstoreInstallerDelegateForTesting(
       WebstoreInstaller::Delegate* delegate);
+
+  // Lets tests provide an extension ID that can be installed silently.
+  static void SetTrustedIDForTesting(const char* extension_id);
 };
 
 class BeginInstallWithManifestFunction
@@ -109,6 +112,59 @@ class CompleteInstallFunction : public SyncExtensionFunction {
   DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.completeInstall");
 };
 
+class SilentlyInstallFunction : public AsyncExtensionFunction,
+                                public WebstoreInstallHelper::Delegate,
+                                public WebstoreInstaller::Delegate {
+ public:
+  SilentlyInstallFunction();
+
+  // Result codes for the return value. If you change this, make sure to
+  // update the description for the silentlyInstall callback in
+  // extension_api.json.
+  enum ResultCode {
+    ERROR_NONE = 0,
+
+    // An unspecified error occurred.
+    UNKNOWN_ERROR,
+
+    // The manifest failed to parse correctly.
+    MANIFEST_ERROR,
+
+    // The extension id was invalid.
+    INVALID_ID,
+
+    // The page does not have permission to call this function.
+    PERMISSION_DENIED,
+  };
+
+  // WebstoreInstallHelper::Delegate implementation.
+  virtual void OnWebstoreParseSuccess(
+      const std::string& id,
+      const SkBitmap& icon,
+      base::DictionaryValue* parsed_manifest) OVERRIDE;
+  virtual void OnWebstoreParseFailure(
+      const std::string& id,
+      InstallHelperResultCode result_code,
+      const std::string& error_message) OVERRIDE;
+
+  // WebstoreInstaller::Delegate implementation.
+  virtual void OnExtensionInstallSuccess(const std::string& id) OVERRIDE;
+  virtual void OnExtensionInstallFailure(const std::string& id,
+                                         const std::string& error) OVERRIDE;
+
+ protected:
+  virtual ~SilentlyInstallFunction();
+  virtual bool RunImpl() OVERRIDE;
+
+  // Sets the result_ as a string based on |code|.
+  void SetResult(ResultCode code);
+
+ private:
+  std::string id_;
+  std::string manifest_;
+  DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.silentlyInstall");
+};
+
 class GetBrowserLoginFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.getBrowserLogin");