Make View::Paint use ui::PaintRecorder to access PaintContext's canvas

ui/compositor/clip_transform_recorder.cc

Index: ui/compositor/clip_transform_recorder.cc
diff --git a/ui/compositor/clip_transform_recorder.cc b/ui/compositor/clip_transform_recorder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5a773f27f6388f9bff0895d94e8ad3afd72b9bc0
--- /dev/null
+++ b/ui/compositor/clip_transform_recorder.cc
@@ -0,0 +1,41 @@
+// Copyright 2015 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/compositor/clip_transform_recorder.h"
+
+#include "ui/compositor/paint_context.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/transform.h"
+
+namespace ui {
+
+ClipTransformRecorder::ClipTransformRecorder(const PaintContext& context,
+                                             const gfx::Rect& clip_rect)
+    : canvas_(context.canvas()) {
+  canvas_->Save();
+  canvas_->ClipRect(clip_rect);
+}
+
+ClipTransformRecorder::ClipTransformRecorder(const PaintContext& context,
+                                             const gfx::Transform& transform)
+    : canvas_(context.canvas()) {
+  canvas_->Save();
+  canvas_->Transform(transform);
+}
+
+ClipTransformRecorder::ClipTransformRecorder(const PaintContext& context,
+                                             const gfx::Rect& clip_rect,
+                                             const gfx::Transform& transform)
+    : canvas_(context.canvas()) {
+  canvas_->Save();
+  canvas_->ClipRect(clip_rect);
+  canvas_->Transform(transform);
+}
+
+ClipTransformRecorder::~ClipTransformRecorder() {
+  canvas_->Restore();
+}
+
+}  // namespace ui