Allow chromedriver to install an extension and get all installed extension IDs.

chrome/test/webdriver/webdriver_session.cc

Index: chrome/test/webdriver/webdriver_session.cc
diff --git a/chrome/test/webdriver/webdriver_session.cc b/chrome/test/webdriver/webdriver_session.cc
index 74ad4a1877e7c5f5144366045af59f52248022df..b089b632ee5fe03f9ae2d191fb4c9f90925aedef 100644
--- a/chrome/test/webdriver/webdriver_session.cc
+++ b/chrome/test/webdriver/webdriver_session.cc
@@ -997,12 +997,35 @@ Error* Session::WaitForAllTabsToStopLoading() {
   return error;
 }
 
-Error* Session::InstallExtension(const FilePath& path) {
+Error* Session::InstallExtensionDeprecated(const FilePath& path) {
+  Error* error = NULL;
+  RunSessionTask(NewRunnableMethod(
+      automation_.get(),
+      &Automation::InstallExtensionDeprecated,
+      path,
+      &error));
+  return error;
+}
+
+Error* Session::GetInstalledExtensions(
+    std::vector<std::string>* extension_ids) {
+  Error* error = NULL;
+  RunSessionTask(NewRunnableMethod(
+      automation_.get(),
+      &Automation::GetInstalledExtensions,
+      extension_ids,
+      &error));
+  return error;
+}
+
+Error* Session::InstallExtension(
+    const FilePath& path, std::string* extension_id) {
   Error* error = NULL;
   RunSessionTask(NewRunnableMethod(
       automation_.get(),
       &Automation::InstallExtension,
       path,
+      extension_id,
       &error));
   return error;
 }