Add a mojom for delivering pointer events in packets

We don't use this interface yet.

sky/services/engine/BUILD.gn

@@ -9,4 +9,8 @@ mojom("interfaces") {
     "input_event.mojom",
     "sky_engine.mojom",
   ]
+
+  deps = [
+    "//sky/services/pointer:interfaces"
+  ]
 }

sky/services/engine/sky_engine.mojom

@@ -5,6 +5,7 @@
 module sky;
 
 import "sky/services/engine/input_event.mojom";
+import "sky/services/pointer/pointer.mojom";
 
 struct ViewportMetrics {
   int32 physical_width;
@@ -22,6 +23,7 @@ interface SkyEngine {
 
   OnViewportMetricsChanged(ViewportMetrics metrics);
   OnInputEvent(InputEvent event);
+  OnPointerPacket(pointer.PointerPacket packet);
 
   RunFromNetwork(string url);
   RunFromFile(string main, string package_root);

sky/services/pointer/BUILD.gn

+# 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.
+
+import("//mojo/public/tools/bindings/mojom.gni")
+
+mojom("interfaces") {
+  sources = [
+    "pointer.mojom",
+  ]
+}

sky/services/pointer/pointer.mojom

+// 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.
+
+[DartPackage="sky_services"]
+module pointer;
+
+enum PointerType {
+  DOWN,
+  UP,
+  MOVE,
+  CANCEL,
+};
+
+enum PointerKind {
+  TOUCH,
+  MOUSE,
+  STYLUS,
+  INVERTED_STYLUS,
+};
+
+struct Pointer {
+  int64 time_stamp;
+  int32 pointer;
+  PointerType type;
+  PointerKind kind;
+  float x;
+  float y;
+  int32 buttons;
+  bool down;
+  bool primary;
+  bool obscured;
+  float pressure;
+  float pressure_min;
+  float pressure_max;
+  float distance;
+  float distance_min;
+  float distance_max;
+  float radius_major;
+  float radius_minor;
+  float radius_min;
+  float radius_max;
+  float orientation;
+  float tilt;
+};
+
+struct PointerPacket {
+  array<Pointer> pointers;
+};
+
+interface PointerListener {
+  OnPointerPacket(PointerPacket packet);
+};

sky/shell/ui/engine.cc

@@ -164,6 +164,10 @@ void Engine::OnInputEvent(InputEventPtr event) {
     sky_view_->HandleInputEvent(*web_event);
 }
 
+void Engine::OnPointerPacket(pointer::PointerPacketPtr packet) {
+  // TODO(abarth): Process pointer events in packets.
+}
+
 void Engine::RunFromLibrary(const std::string& name) {
   sky_view_ = blink::SkyView::Create(this);
   sky_view_->CreateView(blink::WebString::fromUTF8(name));

sky/shell/ui/engine.h

@@ -70,6 +70,7 @@ class Engine : public UIDelegate,
   // SkyEngine implementation:
   void OnViewportMetricsChanged(ViewportMetricsPtr metrics) override;
   void OnInputEvent(InputEventPtr event) override;
+  void OnPointerPacket(pointer::PointerPacketPtr packet) override;
 
   void RunFromNetwork(const mojo::String& url) override;
   void RunFromFile(const mojo::String& main,