Send screenshots back to the client for debugging

chrome/test/webdriver/session.h

Index: chrome/test/webdriver/session.h
diff --git a/chrome/test/webdriver/session.h b/chrome/test/webdriver/session.h
index 222823c24a4697f305065a251800038d07669368..90774c8feb344d8b95393c47357f7bb3ffa83516 100644
--- a/chrome/test/webdriver/session.h
+++ b/chrome/test/webdriver/session.h
@@ -80,7 +80,6 @@ class Session {
   void MouseClick(const gfx::Point& click, int flags);
   bool MouseMove(const gfx::Point& location);
   bool MouseDrag(const gfx::Point& start, const gfx::Point& end);
-
   bool NavigateToURL(const std::string& url);
   bool GoForward();
   bool GoBack();
@@ -93,6 +92,8 @@ class Session {
              std::string* cookie);
   bool DeleteCookie(const GURL& url, const std::string& cookie_name);
   bool SetCookie(const GURL& url, const std::string& cookie);
+  bool CaptureEntirePageAsPNG(const FilePath& path);
+  bool ScreenshotAsBase64(std::string* screenshot);
 
   // Gets all the currently existing window IDs. Returns true on success.
   bool GetWindowIds(std::vector<int>* window_ids);
@@ -147,28 +148,19 @@ class Session {
   // Waits for all tabs to stop loading. Returns true on success.
   bool WaitForAllTabsToStopLoading();
 
-  inline const std::string& id() const { return id_; }
-
-  inline int implicit_wait() const { return implicit_wait_; }
-  inline void set_implicit_wait(const int& timeout) {
-    implicit_wait_ = timeout > 0 ? timeout : 0;
-  }
+  std::string Id() const;
 
-  enum Speed { kSlow, kMedium, kFast, kUnknown };
-  inline Speed speed() { return speed_; }
-  inline void set_speed(Speed speed) {
-    speed_ = speed;
-  }
+  int ImplicitWait() const;
+  void SetImplicitWait(const int timeout);
 
-  inline const std::string& current_frame_xpath() const {
-    return current_frame_xpath_;
-  }
+  enum InputSpeed { kSlow, kMedium, kFast, kUnknown };
+  Session::InputSpeed Speed() const;
+  void SetSpeed(const InputSpeed& speed);
 
-  inline void set_current_frame_xpath(const std::string& xpath) {
-    current_frame_xpath_ = xpath;
-  }
+  std::string CurrentFrameXPath() const;
+  void SetCurrentFrameXPath(const std::string& xpath);
 
-  inline int current_window_id() const { return current_window_id_; }
+  int CurrentWindowId() const;
 
  private:
   void RunSessionTask(Task* task);
@@ -200,7 +192,7 @@ class Session {
   base::Thread thread_;
 
   int implicit_wait_;
-  Speed speed_;
+  InputSpeed speed_;
 
   // The XPath to the frame within this session's active tab which all
   // commands should be directed to. XPath strings can represent a frame deep