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

Previously Point served two purposes, to be a position in 2d space, and also
an offset from the origin. This introduces a Vector2d class to represent an
offset, allowing typesafety checks for geometric operations.

The following are now the case:

Point +/- Vector = Point
- A point plus/minus an offset gives you a point at a position offset by the
vector.

Vector +/- Vector = Vector
- Two offsets can be added together to make a new offset.

Point - Point = Vector
- Subtracting one point from another gives you the offset between the two
points.

We add some new methods to perform these operations:

Rect::OffsetFromOrigin() gives the offset between the position of the rect
and the origin.

Point::OffsetFromOrigin() gives the offset between the point and the origin.

PointAtOffsetFromOrigin(Vector2d) converts a Vector2d to a Point at the given
offset away from the origin.

Rect::Offset(), Point::Add(), and Point::Subtract() now receive a Vector2d
instead of a point.

BUG=147395
R=sky

Review URL: https://codereview.chromium.org/11269022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@165198 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 4 insertions, 4 deletions

diff --git a/content/port/browser/render_view_host_delegate_view.h b/content/port/browser/render_view_host_delegate_view.h
index b59d6e0..4b84cb84 100644
--- a/content/port/browser/render_view_host_delegate_view.h
+++ b/content/port/browser/render_view_host_delegate_view.h
@@ -18,8 +18,8 @@ struct WebMenuItem;
 
 namespace gfx {
 class ImageSkia;
-class Point;
 class Rect;
+class Vector2d;
 }
 
 namespace content {
@@ -53,7 +53,7 @@ class CONTENT_EXPORT RenderViewHostDelegateView {
   virtual void StartDragging(const WebDropData& drop_data,
                              WebKit::WebDragOperationsMask allowed_ops,
                              const gfx::ImageSkia& image,
-                             const gfx::Point& image_offset) {}
+                             const gfx::Vector2d& image_offset) {}
 
   // The page wants to update the mouse cursor during a drag & drop operation.
   // |operation| describes the current operation (none, move, copy, link.)
diff --git a/content/port/browser/render_widget_host_view_port.h b/content/port/browser/render_widget_host_view_port.h
index ef4f507..ffa1b6d 100644
--- a/content/port/browser/render_widget_host_view_port.h
+++ b/content/port/browser/render_widget_host_view_port.h
@@ -79,7 +79,7 @@ class CONTENT_EXPORT RenderWidgetHostViewPort : public RenderWidgetHostView {
   // Moves all plugin windows as described in the given list.
   // |scroll_offset| is the scroll offset of the render view.
   virtual void MovePluginWindows(
-      const gfx::Point& scroll_offset,
+      const gfx::Vector2d& scroll_offset,
       const std::vector<webkit::npapi::WebPluginGeometry>& moves) = 0;
 
   // Take focus from the associated View component.
@@ -229,7 +229,7 @@ class CONTENT_EXPORT RenderWidgetHostViewPort : public RenderWidgetHostView {
 #if defined(OS_ANDROID)
   virtual void SetCachedPageScaleFactorLimits(float minimum_scale,
                                               float maximum_scale) = 0;
-  virtual void UpdateFrameInfo(const gfx::Point& scroll_offset,
+  virtual void UpdateFrameInfo(const gfx::Vector2d& scroll_offset,
                                float page_scale_factor,
                                const gfx::Size& content_size) = 0;
   virtual void HasTouchEventHandlers(bool need_touch_events) = 0;