ui/android: Fix Resource meta-data sharing with ResourceManager.

ui/android/resources/nine_patch_resource.cc

+// Copyright 2017 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/android/resources/nine_patch_resource.h"
+
+#include "base/memory/ptr_util.h"
+
+namespace ui {
+
+// static
+NinePatchResource* NinePatchResource::From(Resource* resource) {
+  DCHECK_EQ(Type::NINE_PATCH_BITMAP, resource->type());

[mdjones, 2017/03/10 18:12:00]

Where is type_ set for this class?

[Khushal, 2017/03/10 19:19:24]

Woops. I didn't realize the code here was using the default Resource ctor.
Note to self: next time actually run the code before sending for review. :P

+  return static_cast<NinePatchResource*>(resource);
+}
+
+NinePatchResource::NinePatchResource(gfx::Rect padding, gfx::Rect aperture)
+    : padding_(padding), aperture_(aperture) {}
+
+NinePatchResource::~NinePatchResource() = default;
+
+gfx::Rect NinePatchResource::Border(const gfx::Size& bounds) const {
+  return Border(bounds, gfx::InsetsF(1.f, 1.f, 1.f, 1.f));
+}
+
+gfx::Rect NinePatchResource::Border(const gfx::Size& bounds,
+                                    const gfx::InsetsF& scale) const {
+  // Calculate whether or not we need to scale down the border if the bounds of
+  // the layer are going to be smaller than the aperture padding.
+  float x_scale = std::min((float)bounds.width() / size().width(), 1.f);
+  float y_scale = std::min((float)bounds.height() / size().height(), 1.f);
+
+  float left_scale = std::min(x_scale * scale.left(), 1.f);
+  float right_scale = std::min(x_scale * scale.right(), 1.f);
+  float top_scale = std::min(y_scale * scale.top(), 1.f);
+  float bottom_scale = std::min(y_scale * scale.bottom(), 1.f);
+
+  return gfx::Rect(aperture_.x() * left_scale, aperture_.y() * top_scale,
+                   (size().width() - aperture_.width()) * right_scale,
+                   (size().height() - aperture_.height()) * bottom_scale);
+}
+
+std::unique_ptr<Resource> NinePatchResource::CreateForCopy() {
+  return base::MakeUnique<NinePatchResource>(padding_, aperture_);
+}
+
+}  // namespace ui