Add "stylus-tools" Wayland protocol.

components/exo/wayland/server.cc

Index: components/exo/wayland/server.cc
diff --git a/components/exo/wayland/server.cc b/components/exo/wayland/server.cc
index 099429624c776812176b9109acb65ebd7e8fd236..e541591d3e903afb76ed5383054e4e9e57f4b1b2 100644
--- a/components/exo/wayland/server.cc
+++ b/components/exo/wayland/server.cc
@@ -15,6 +15,7 @@
 #include <secure-output-unstable-v1-server-protocol.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stylus-tools-unstable-v1-server-protocol.h>
 #include <stylus-unstable-v1-server-protocol.h>
 #include <stylus-unstable-v2-server-protocol.h>
 #include <viewporter-server-protocol.h>
@@ -164,6 +165,10 @@ DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSurfaceHasBlendingKey, false);
 // to ignore the activation event originated by creation.
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kIgnoreWindowActivated, true);
 
+// A property key containing a boolean set to true if the stylus_tool
+// object is associated with a window.
+DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSurfaceHasStylusToolKey, false);
+
 wl_resource* GetSurfaceResource(Surface* surface) {
   return surface->GetProperty(kSurfaceResourceKey);
 }
@@ -3839,6 +3844,87 @@ void bind_keyboard_configuration(wl_client* client,
       resource, &keyboard_configuration_implementation, data, nullptr);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// stylus_tool interface:
+
+class StylusTool : public SurfaceObserver {
+ public:
+  explicit StylusTool(Surface* surface) : surface_(surface) {
+    surface_->AddSurfaceObserver(this);
+    surface_->SetProperty(kSurfaceHasStylusToolKey, true);
+  }
+  ~StylusTool() override {
+    if (surface_) {
+      surface_->RemoveSurfaceObserver(this);
+      surface_->SetProperty(kSurfaceHasStylusToolKey, false);
+    }
+  }
+
+  void SetStylusOnly() { surface_->SetStylusOnly(); }
+
+  // Overridden from SurfaceObserver:
+  void OnSurfaceDestroying(Surface* surface) override {
+    surface->RemoveSurfaceObserver(this);
+    surface_ = nullptr;
+  }
+
+ private:
+  Surface* surface_;
+
+  DISALLOW_COPY_AND_ASSIGN(StylusTool);
+};
+
+void stylus_tool_destroy(wl_client* client, wl_resource* resource) {
+  wl_resource_destroy(resource);
+}
+
+void stylus_tool_set_stylus_only(wl_client* client, wl_resource* resource) {
+  GetUserDataAs<StylusTool>(resource)->SetStylusOnly();
+}
+
+const struct zcr_stylus_tool_v1_interface stylus_tool_implementation = {
+    stylus_tool_destroy, stylus_tool_set_stylus_only};
+
+////////////////////////////////////////////////////////////////////////////////
+// stylus_tools interface:
+
+void stylus_tools_destroy(wl_client* client, wl_resource* resource) {
+  wl_resource_destroy(resource);
+}
+
+void stylus_tools_get_stylus_tool(wl_client* client,
+                                  wl_resource* resource,
+                                  uint32_t id,
+                                  wl_resource* surface_resource) {
+  Surface* surface = GetUserDataAs<Surface>(surface_resource);
+  if (surface->GetProperty(kSurfaceHasStylusToolKey)) {
+    wl_resource_post_error(
+        resource, ZCR_STYLUS_TOOLS_V1_ERROR_STYLUS_TOOL_EXISTS,
+        "a stylus_tool object for that surface already exists");
+    return;
+  }
+
+  wl_resource* stylus_tool_resource =
+      wl_resource_create(client, &zcr_stylus_tool_v1_interface, 1, id);
+
+  SetImplementation(stylus_tool_resource, &stylus_tool_implementation,
+                    base::MakeUnique<StylusTool>(surface));
+}
+
+const struct zcr_stylus_tools_v1_interface stylus_tools_implementation = {
+    stylus_tools_destroy, stylus_tools_get_stylus_tool};
+
+void bind_stylus_tools(wl_client* client,
+                       void* data,
+                       uint32_t version,
+                       uint32_t id) {
+  wl_resource* resource =
+      wl_resource_create(client, &zcr_stylus_tools_v1_interface, 1, id);
+
+  wl_resource_set_implementation(resource, &stylus_tools_implementation, data,
+                                 nullptr);
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -3891,6 +3977,8 @@ Server::Server(Display* display)
                    bind_stylus_v2);
   wl_global_create(wl_display_.get(), &zcr_keyboard_configuration_v1_interface,
                    2, display_, bind_keyboard_configuration);
+  wl_global_create(wl_display_.get(), &zcr_stylus_tools_v1_interface, 1,
+                   display_, bind_stylus_tools);
 }
 
 Server::~Server() {}