Bug 968811 - TextureClientD3D11::ImplementsLocking. r=mattwoodrow

gfx/layers/d3d11/TextureD3D11.h

@@ -43,6 +43,8 @@ public:
 
   virtual bool IsLocked() const MOZ_OVERRIDE { return mIsLocked; }
 
+  virtual bool ImplementsLocking() const MOZ_OVERRIDE { return true; }
+
   virtual bool ToSurfaceDescriptor(SurfaceDescriptor& aOutDescriptor) MOZ_OVERRIDE;
 
   virtual gfx::IntSize GetSize() const MOZ_OVERRIDE { return mSize; }