Add Vector2d classes that represent offsets, instead of using Point.

ui/gfx/blit.cc

 // Copyright (c) 2012 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.
 
 #include "ui/gfx/blit.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "skia/ext/platform_canvas.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/vector2d.h"
 
 #if defined(OS_OPENBSD)
 #include <cairo.h>
 #elif defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 #include <cairo/cairo.h>
 #endif
 
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_cftyperef.h"
 #endif
@@ skipping 99 matching lines @@
   DCHECK(skia::SupportsPlatformPaint(dst_canvas));
   DCHECK(skia::SupportsPlatformPaint(src_canvas));
   BlitContextToContext(skia::BeginPlatformPaint(dst_canvas), dst_rect,
                        skia::BeginPlatformPaint(src_canvas), src_origin);
   skia::EndPlatformPaint(src_canvas);
   skia::EndPlatformPaint(dst_canvas);
 }
 
 void ScrollCanvas(SkCanvas* canvas,
                   const gfx::Rect& in_clip,
-                  const gfx::Point& amount) {
+                  const gfx::Vector2d& amount) {
   DCHECK(!HasClipOrTransform(*canvas));  // Don't support special stuff.
 #if defined(OS_WIN)
   // If we have a PlatformCanvas, we should use ScrollDC. Otherwise, fall
   // through to the software implementation.
   if (skia::SupportsPlatformPaint(canvas)) {
     skia::ScopedPlatformPaint scoped_platform_paint(canvas);
     HDC hdc = scoped_platform_paint.GetPlatformSurface();
 
     RECT damaged_rect;
     RECT r = in_clip.ToRECT();
@@ skipping 45 matching lines @@
     // Fortunately, memmove already handles this for us.
     for (int y = 0; y < dest_rect.height(); y++) {
       memmove(bitmap.getAddr32(dest_rect.x(), dest_rect.y() + y),
               bitmap.getAddr32(src_rect.x(), src_rect.y() + y),
               row_bytes);
     }
   }
 }
 
 }  // namespace gfx