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diff --git a/base/gfx/platform_device_mac.cc b/base/gfx/platform_device_mac.cc
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+// Copyright 2008, 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:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/gfx/platform_device_mac.h"
+
+#include "base/logging.h"
+#include "base/gfx/skia_utils_mac.h"
+#include "SkMatrix.h"
+#include "SkPath.h"
+#include "SkUtils.h"
+
+namespace gfx {
+
+namespace {
+
+// Constrains position and size to fit within available_size.
+bool constrain(int available_size, int* position, int *size) {
+  if (*position < 0) {
+    *size += *position;
+    *position = 0;
+  }
+  if (*size > 0 && *position < available_size) {
+    int overflow = (*position + *size) - available_size;
+    if (overflow > 0) {
+      *size -= overflow;
+    }
+    return true;
+  }
+  return false;
+}
+
+// Sets the opacity of the specified value to 0xFF.
+void makeOpaqueAlphaAdjuster(uint32_t* pixel) {
+  *pixel |= 0xFF000000;
+}
+
+} // namespace
+
+PlatformDeviceMac::PlatformDeviceMac(const SkBitmap& bitmap)
+    : SkDevice(bitmap) {
+}
+
+void PlatformDeviceMac::makeOpaque(int x, int y, int width, int height) {
+  processPixels(x, y, width, height, makeOpaqueAlphaAdjuster);
+}
+
+// Set up the CGContextRef for peaceful coexistence with Skia
+void PlatformDeviceMac::InitializeCGContext(CGContextRef context) {
+  // CG defaults to the same settings as Skia
+}
+
+// static
+void PlatformDeviceMac::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};
+  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: {
+        NOTREACHED();
+        break;
+      }
+    }
+  }
+  CGContextClosePath(context);
+}
+
+// static
+void PlatformDeviceMac::LoadTransformToCGContext(CGContextRef context,
+                                                 const SkMatrix& matrix) {
+  // TOOD: CoreGraphics can concatenate transforms, but not reset the current
+  // ont.  Either find a workaround or remove this function if it turns out
+  // to be unneeded on the Mac.
+}
+
+}  // namespace gfx