compositor-worker: Introduce WebCompositorMutableState

cc/blink/web_mutable_state_impl.h

+// 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.
+
+#ifndef CC_BLINK_WEB_MUTABLE_STATE_IMPL_H_
+#define CC_BLINK_WEB_MUTABLE_STATE_IMPL_H_
+
+#include <map>
+
+#include "cc/blink/cc_blink_export.h"
+
+#include "third_party/WebKit/public/platform/WebMutableState.h"
+
+namespace cc {
+class LayerImpl;
+class LayerTreeImpl;
+struct LayerTreeMutation;
+typedef std::map<uint64_t, LayerTreeMutation> LayerTreeMutationMap;
+}
+
+namespace cc_blink {
+
+class CC_BLINK_EXPORT WebMutableStateImpl : public blink::WebMutableState {
+ public:
+  WebMutableStateImpl(cc::LayerTreeMutation* mutation,
+                      cc::LayerImpl* main_layer,
+                      cc::LayerImpl* scroll_layer);
+  ~WebMutableStateImpl() override;
+
+  double getOpacity() const override;
+  void setOpacity(double opacity) override;
+
+  const SkMatrix44& getTransform() const override;
+  void setTransform(const SkMatrix44& transform) override;
+
+  double getScrollLeft() const override;
+  void setScrollLeft(double scroll_left) override;
+
+  double getScrollTop() const override;
+  void setScrollTop(double scroll_top) override;
+
+ private:
+  cc::LayerTreeMutation* mutation_;
+  cc::LayerImpl* main_layer_;
+  cc::LayerImpl* scroll_layer_;
+};
+
+class CC_BLINK_EXPORT WebMutableStateProviderImpl

[enne (OOO), 2015/11/16 19:12:33]

Different classes, different files?

[Ian Vollick, 2015/11/18 17:20:33]

Done.

+    : public blink::WebMutableStateProvider {
+ public:
+  // TODO(vollick): after slimming paint v2, this will need to operate on
+  // property trees, no the layer tree impl.

[enne (OOO), 2015/11/16 19:12:33]

*not

[Ian Vollick, 2015/11/18 17:20:33]

Done.

+  WebMutableStateProviderImpl(cc::LayerTreeImpl* state,

[enne (OOO), 2015/11/16 19:12:33]

Who owns these pointers?

[Ian Vollick, 2015/11/18 17:20:33]

Caller owns them. Added a comment.

+                              cc::LayerTreeMutationMap* mutations);
+  ~WebMutableStateProviderImpl() override;
+
+  blink::WebMutableState* getMutableStateFor(uint64_t element_id) override;
+
+ private:
+  cc::LayerTreeImpl* state_;
+  cc::LayerTreeMutationMap* mutations_;
+};
+
+}  // namespace cc_blink
+
+#endif  // CC_BLINK_WEB_MUTABLE_STATE_IMPL_H_