Implement pinch-zoom scaling for main-frame scrollbars and pinch-zoom overlay scrollbars.

cc/pinch_zoom_scrollbar_geometry.h

Index: cc/pinch_zoom_scrollbar_geometry.h
diff --git a/cc/pinch_zoom_scrollbar_geometry.h b/cc/pinch_zoom_scrollbar_geometry.h
new file mode 100644
index 0000000000000000000000000000000000000000..b649044d300279252337caa1cc11ace972fcd915
--- /dev/null
+++ b/cc/pinch_zoom_scrollbar_geometry.h
@@ -0,0 +1,58 @@
+// Copyright 2013 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 CC_PINCH_ZOOM_SCROLLBAR_GEOMETRY_H_
+#define CC_PINCH_ZOOM_SCROLLBAR_GEOMETRY_H_
+
+#include "cc/cc_export.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbarThemeGeometry.h"
+
+namespace WebKit {

[jamesr, 2013/02/26 20:48:46]

Code in cc/ should be in namespace cc::

[wjmaclean, 2013/03/01 15:30:32]

Done.

+
+class CC_EXPORT PinchZoomScrollbarGeometry : public WebScrollbarThemeGeometry {
+ public:
+  virtual ~PinchZoomScrollbarGeometry() {}
+
+  const int kTrackWidth = 10;

[jamesr, 2013/02/26 20:48:46]

Another duplicate?

[wjmaclean, 2013/03/01 15:30:32]

Fixed.

I forgot I had two. I removed the one in PinchZoomScrollbar, since this should
really reside in the geometry class.

+
+  virtual WebScrollbarThemeGeometry* clone() const OVERRIDE;

[jamesr, 2013/02/26 20:48:46]

Same comments as above re OVERRIDE and comment

[wjmaclean, 2013/03/01 15:30:32]

Done.

+  virtual int thumbPosition(WebScrollbar*) OVERRIDE;

[jamesr, 2013/02/26 20:48:46]

In chromium style all parameters have names

[wjmaclean, 2013/03/01 15:30:32]

Done.

+  virtual int thumbLength(WebScrollbar*) OVERRIDE;
+  virtual int trackPosition(WebScrollbar*) OVERRIDE;
+  virtual int trackLength(WebScrollbar*) OVERRIDE;
+  virtual bool hasButtons(WebScrollbar*) OVERRIDE { return false; }

[jamesr, 2013/02/26 20:48:46]

In chromium style, all overrides with code (even if it's just a return
statement) should go in the .cc

[wjmaclean, 2013/03/01 15:30:32]

Done.

+  virtual bool hasThumb(WebScrollbar*) OVERRIDE { return true; }
+  virtual WebRect trackRect(WebScrollbar*) OVERRIDE;
+  virtual WebRect thumbRect(WebScrollbar*) OVERRIDE;
+  virtual int minimumThumbLength(WebScrollbar*) OVERRIDE;
+  virtual int scrollbarThickness(WebScrollbar*) OVERRIDE;
+  virtual WebRect backButtonStartRect(WebScrollbar*) OVERRIDE
+  {
+    return WebRect();
+  }
+
+  virtual WebRect backButtonEndRect(WebScrollbar*) OVERRIDE
+  {
+    return WebRect();
+  }
+
+  virtual WebRect forwardButtonStartRect(WebScrollbar*) OVERRIDE
+  {
+    return WebRect();
+  }
+
+  virtual WebRect forwardButtonEndRect(WebScrollbar*) OVERRIDE {
+    return WebRect();
+  }
+
+  virtual WebRect constrainTrackRectToTrackPieces(WebScrollbar*, const WebRect&)
+    OVERRIDE;
+  virtual void splitTrack(

[jamesr, 2013/02/26 20:48:46]

newline between functions

[wjmaclean, 2013/03/01 15:30:32]

Done.

+    WebScrollbar*, const WebRect& track, WebRect& startTrack, WebRect& thumb,
+    WebRect& endTrack) OVERRIDE;
+
+};
+
+} // namespace WebKit
+#endif  // CC_PINCH_ZOOM_SCROLLBAR_GEOMETRY_H_