Update from https://crrev.com/317530

skia/ext/platform_device_mac.cc

 // Copyright (c) 2006-2008 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 "skia/ext/platform_device.h"
 #include "skia/ext/bitmap_platform_device.h"
 
 #import <ApplicationServices/ApplicationServices.h>
 #include "skia/ext/skia_utils_mac.h"
 #include "third_party/skia/include/core/SkMatrix.h"
@@ skipping 12 matching lines @@
 }
 
 CGContextRef PlatformDevice::BeginPlatformPaint() {
   return GetBitmapContext();
 }
 
 void PlatformDevice::EndPlatformPaint() {
   // Flushing will be done in onAccessBitmap.
 }
 
-// Set up the CGContextRef for peaceful coexistence with Skia
-void PlatformDevice::InitializeCGContext(CGContextRef context) {
-  // CG defaults to the same settings as Skia
-}
-
-// static
-void PlatformDevice::LoadPathToCGContext(CGContextRef context,
-                                         const SkPath& path) {
-  // instead of a persistent attribute of the context, CG specifies the fill
-  // type per call, so we just have to load up the geometry.
-  CGContextBeginPath(context);
-
-  SkPoint points[4] = { {0, 0}, {0, 0}, {0, 0}, {0, 0} };
-  SkPath::Iter iter(path, false);
-  for (SkPath::Verb verb = iter.next(points); verb != SkPath::kDone_Verb;
-       verb = iter.next(points)) {
-    switch (verb) {
-      case SkPath::kMove_Verb: {  // iter.next returns 1 point
-        CGContextMoveToPoint(context, points[0].fX, points[0].fY);
-        break;
-      }
-      case SkPath::kLine_Verb: {  // iter.next returns 2 points
-        CGContextAddLineToPoint(context, points[1].fX, points[1].fY);
-        break;
-      }
-      case SkPath::kQuad_Verb: {  // iter.next returns 3 points
-        CGContextAddQuadCurveToPoint(context, points[1].fX, points[1].fY,
-                                     points[2].fX, points[2].fY);
-        break;
-      }
-      case SkPath::kCubic_Verb: {  // iter.next returns 4 points
-        CGContextAddCurveToPoint(context, points[1].fX, points[1].fY,
-                                 points[2].fX, points[2].fY,
-                                 points[3].fX, points[3].fY);
-        break;
-      }
-      case SkPath::kClose_Verb: {  // iter.next returns 1 point (the last point)
-        break;
-      }
-      case SkPath::kDone_Verb:  // iter.next returns 0 points
-      default: {
-        SkASSERT(false);
-        break;
-      }
-    }
-  }
-  CGContextClosePath(context);
-}
-
-// static
-void PlatformDevice::LoadTransformToCGContext(CGContextRef context,
-                                              const SkMatrix& matrix) {
-  // CoreGraphics can concatenate transforms, but not reset the current one.
-  // So in order to get the required behavior here, we need to first make
-  // the current transformation matrix identity and only then load the new one.
-
-  // Reset matrix to identity.
-  CGAffineTransform orig_cg_matrix = CGContextGetCTM(context);
-  CGAffineTransform orig_cg_matrix_inv = CGAffineTransformInvert(
-      orig_cg_matrix);
-  CGContextConcatCTM(context, orig_cg_matrix_inv);
-
-  // assert that we have indeed returned to the identity Matrix.
-  SkASSERT(CGAffineTransformIsIdentity(CGContextGetCTM(context)));
-
-  // Convert xform to CG-land.
-  // Our coordinate system is flipped to match WebKit's so we need to modify
-  // the xform to match that.
-  SkMatrix transformed_matrix = matrix;
-  SkScalar sy = matrix.getScaleY() * (SkScalar)-1;
-  transformed_matrix.setScaleY(sy);
-  size_t height = CGBitmapContextGetHeight(context);
-  SkScalar ty = -matrix.getTranslateY(); // y axis is flipped.
-  transformed_matrix.setTranslateY(ty + (SkScalar)height);
-
-  CGAffineTransform cg_matrix = gfx::SkMatrixToCGAffineTransform(
-      transformed_matrix);
-
-  // Load final transform into context.
-  CGContextConcatCTM(context, cg_matrix);
-}
-
-// static
-void PlatformDevice::LoadClippingRegionToCGContext(
-         CGContextRef context,
-         const SkRegion& region,
-         const SkMatrix& transformation) {
-  if (region.isEmpty()) {
-    // region can be empty, in which case everything will be clipped.
-    SkRect rect;
-    rect.setEmpty();
-    CGContextClipToRect(context, gfx::SkRectToCGRect(rect));
-  } else if (region.isRect()) {
-    // CoreGraphics applies the current transform to clip rects, which is
-    // unwanted. Inverse-transform the rect before sending it to CG. This only
-    // works for translations and scaling, but not for rotations (but the
-    // viewport is never rotated anyway).
-    SkMatrix t;
-    bool did_invert = transformation.invert(&t);
-    if (!did_invert)
-      t.reset();
-    // Do the transformation.
-    SkRect rect;
-    rect.set(region.getBounds());
-    t.mapRect(&rect);
-    SkIRect irect;
-    rect.round(&irect);
-    CGContextClipToRect(context, gfx::SkIRectToCGRect(irect));
-  } else {
-    // It is complex.
-    SkPath path;
-    region.getBoundaryPath(&path);
-    // Clip. Note that windows clipping regions are not affected by the
-    // transform so apply it manually.
-    path.transform(transformation);
-    // TODO(playmobil): Implement.
-    SkASSERT(false);
-    // LoadPathToDC(context, path);
-    // hrgn = PathToRegion(context);
-  }
-}
-
 }  // namespace skia