Clean up transform methods in GraphicsContext.

Source/platform/graphics/GraphicsContext.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 353 matching lines @@
     typedef unsigned Edges;
     void drawInnerShadow(const RoundedRect&, const Color& shadowColor, const IntSize shadowOffset, int shadowBlur, int shadowSpread, Edges clippedEdges = NoEdge);
 
     // This clip function is used only by <canvas> code. It allows
     // implementations to handle clipping on the canvas differently since
     // the discipline is different.
     void canvasClip(const Path&, WindRule = RULE_EVENODD);
     void clipOut(const Path&);
 
     // ---------- Transformation methods -----------------
-    enum IncludeDeviceScale { DefinitelyIncludeDeviceScale, PossiblyIncludeDeviceScale };
-    AffineTransform getCTM(IncludeDeviceScale includeScale = PossiblyIncludeDeviceScale) const;
+    // Note that the getCTM method returns only the current transform from Blink's perspective,
+    // which is not the final transform used to place content on screen. It cannot be relied upon
+    // for testing where a point will appear on screen or how large it will be.
+    AffineTransform getCTM() const;
     void concatCTM(const AffineTransform& affine) { concat(affineTransformToSkMatrix(affine)); }
     void setCTM(const AffineTransform& affine) { setMatrix(affineTransformToSkMatrix(affine)); }
     void setMatrix(const SkMatrix&);
 
-    void scale(const FloatSize&);
+    void scale(float x, float y);
     void rotate(float angleInRadians);
-    void translate(const FloatSize& size) { translate(size.width(), size.height()); }
     void translate(float x, float y);
 
     // This function applies the device scale factor to the context, making the context capable of
     // acting as a base-level context for a HiDPI environment.
-    void applyDeviceScaleFactor(float deviceScaleFactor) { scale(FloatSize(deviceScaleFactor, deviceScaleFactor)); }
+    void applyDeviceScaleFactor(float deviceScaleFactor) { scale(deviceScaleFactor, deviceScaleFactor); }
     // ---------- End transformation methods -----------------
 
     // URL drawing
     void setURLForRect(const KURL&, const IntRect&);
     void setURLFragmentForRect(const String& name, const IntRect&);
     void addURLTargetAtPoint(const String& name, const IntPoint&);
     bool supportsURLFragments() { return printing(); }
 
     // Create an image buffer compatible with this context, with suitable resolution
     // for drawing into the buffer and then into this context.
@@ skipping 139 matching lines @@
     bool m_updatingControlTints : 1;
     bool m_accelerated : 1;
     bool m_isCertainlyOpaque : 1;
     bool m_printing : 1;
     bool m_antialiasHairlineImages : 1;
 };
 
 } // namespace WebCore
 
 #endif // GraphicsContext_h