command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/client/share_group.cc

Index: gpu/command_buffer/client/share_group.cc
diff --git a/gpu/command_buffer/client/share_group.cc b/gpu/command_buffer/client/share_group.cc
index 96ab8d181be01ab52edda453043ad4bbd451bf78..692dfc25e1db5065e40a8237369e7e2288ee5bdc 100644
--- a/gpu/command_buffer/client/share_group.cc
+++ b/gpu/command_buffer/client/share_group.cc
@@ -227,6 +227,35 @@ class NonReusedIdHandler : public IdHandlerInterface {
   GLuint last_id_;
 };
 
+class RangeIdHandler : public RangeIdHandlerInterface {
+ public:
+  RangeIdHandler() {}
+  virtual ~RangeIdHandler() {}
+
+  virtual void MakeIdRange(GLES2Implementation* /*gl_impl*/,
+                           GLsizei n,
+                           GLuint* first_id) override {
+    base::AutoLock auto_lock(lock_);
+    *first_id = id_allocator_.AllocateIDRange(n);
+  }
+
+  virtual void FreeIdRange(GLES2Implementation* gl_impl,
+                           const GLuint first_id,
+                           GLsizei range,
+                           DeleteRangeFn delete_fn) override {
+    DCHECK(range > 0);
+    id_allocator_.FreeIDRange(first_id, range);
+    (gl_impl->*delete_fn)(first_id, range);
+    gl_impl->helper()->CommandBufferHelper::Flush();
+  }
+
+  virtual void FreeContext(GLES2Implementation* gl_impl) override {}
+
+ private:
+  base::Lock lock_;
+  IdAllocator id_allocator_;
+};
+
 ShareGroup::ShareGroup(bool bind_generates_resource)
     : bind_generates_resource_(bind_generates_resource) {
   if (bind_generates_resource) {
@@ -246,6 +275,9 @@ ShareGroup::ShareGroup(bool bind_generates_resource)
       }
     }
   }
+  for (auto& range_id_handler : range_id_handlers_) {
+    range_id_handler.reset(new RangeIdHandler());
+  }
   program_info_manager_.reset(ProgramInfoManager::Create(false));
 }