Implement the webdriver window sizing commands.

chrome/test/webdriver/webdriver_session.h

Index: chrome/test/webdriver/webdriver_session.h
diff --git a/chrome/test/webdriver/webdriver_session.h b/chrome/test/webdriver/webdriver_session.h
index f039edc72653ad8b5684cfdce703acb83acdd4e2..a6c2c83a021282be299299a8e056375a4b821349 100644
--- a/chrome/test/webdriver/webdriver_session.h
+++ b/chrome/test/webdriver/webdriver_session.h
@@ -174,6 +174,12 @@ class Session {
   // session.
   Error* CloseWindow();
 
+  // Gets the bounds for the specified window.
+  Error* GetWindowBounds(const WebViewId& window, Rect* bounds);
+
+  // Sets the bounds for the specified window.
+  Error* SetWindowBounds(const WebViewId& window, const Rect& bounds);
+
   // Gets the message of the currently active JavaScript modal dialog.
   Error* GetAlertMessage(std::string* text);