Add the pdf plugin's source in src\pdf.

pdf/button.h

+// Copyright (c) 2010 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 PDF_BUTTON_H_
+#define PDF_BUTTON_H_
+
+#include "pdf/control.h"
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/rect.h"
+
+namespace chrome_pdf {
+
+class Button : public Control {
+ public:
+  enum ButtonEventIds {
+    EVENT_ID_BUTTON_CLICKED,
+    EVENT_ID_BUTTON_STATE_CHANGED,
+  };
+
+  enum ButtonStyle {
+    BUTTON_CLICKABLE,
+    BUTTON_STATE
+  };
+
+  enum ButtonState {
+    BUTTON_NORMAL,
+    BUTTON_HIGHLIGHTED,
+    BUTTON_PRESSED,
+    BUTTON_PRESSED_STICKY,
+  };
+
+  Button();
+  virtual ~Button();
+  virtual bool CreateButton(uint32 id,
+                            const pp::Point& origin,
+                            bool visible,
+                            Control::Owner* delegate,
+                            ButtonStyle style,
+                            const pp::ImageData& face_normal,
+                            const pp::ImageData& face_highlighted,
+                            const pp::ImageData& face_pressed);
+
+  virtual void Paint(pp::ImageData* image_data, const pp::Rect& rc);
+  virtual bool HandleEvent(const pp::InputEvent& event);
+  virtual void OnEventCaptureReleased();
+  virtual void Show(bool visible, bool invalidate);
+  virtual void AdjustTransparency(uint8 transparency, bool invalidate);
+
+  ButtonState state() const { return state_; }
+  bool IsPressed() const { return state() == BUTTON_PRESSED_STICKY; }
+  void SetPressedState(bool pressed);
+
+ private:
+  void OnButtonClicked();
+
+  const pp::ImageData& GetCurrentImage();
+  void ChangeState(ButtonState new_state, bool force);
+
+  ButtonStyle style_;
+  ButtonState state_;
+  bool is_pressed_;
+
+  pp::ImageData normal_;
+  pp::ImageData highlighted_;
+  pp::ImageData pressed_;
+};
+
+}  // namespace chrome_pdf
+
+#endif  // PDF_BUTTON_H_