gfx: Rename canvas SaveAndUnscale to UnscaleTheDeviceScaleFactor.

ui/gfx/canvas.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/canvas.h"
 
 #include <cmath>
 #include <limits>
 
 #include "base/i18n/rtl.h"
@@ skipping 157 matching lines @@
   paint.setShader(shader.get());
 
   DrawRect(Rect(rect.x(), rect.y(), rect.width(), 1), paint);
   DrawRect(Rect(rect.x(), rect.y() + rect.height() - 1, rect.width(), 1),
            paint);
   DrawRect(Rect(rect.x(), rect.y(), 1, rect.height()), paint);
   DrawRect(Rect(rect.x() + rect.width() - 1, rect.y(), 1, rect.height()),
            paint);
 }
 
+float Canvas::UndoDeviceScaleFactor() {
+  SkScalar scale_factor = 1.0f / image_scale_;
+  canvas_->scale(scale_factor, scale_factor);
+  return image_scale_;
+}
+
 void Canvas::Save() {
   canvas_->save();
 }
 
-float Canvas::SaveAndUnscale() {
-  Save();
-  SkScalar scale_factor = 1.0f / image_scale_;
-  canvas_->scale(scale_factor, scale_factor);
-  return image_scale_;
-}
-
 void Canvas::SaveLayerAlpha(uint8 alpha) {
   canvas_->saveLayerAlpha(NULL, alpha);
 }
 
 void Canvas::SaveLayerAlpha(uint8 alpha, const Rect& layer_bounds) {
   SkRect bounds(RectToSkRect(layer_bounds));
   canvas_->saveLayerAlpha(&bounds, alpha);
 }
 
 void Canvas::Restore() {
@@ skipping 378 matching lines @@
   // by the paint).
   SkPaint p(paint);
   p.setFilterQuality(filter ? kLow_SkFilterQuality : kNone_SkFilterQuality);
   p.setShader(shader.get());
 
   // The rect will be filled by the bitmap.
   canvas_->drawRect(dest_rect, p);
 }
 
 }  // namespace gfx