command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/tests/gl_manager.h

Index: gpu/command_buffer/tests/gl_manager.h
diff --git a/gpu/command_buffer/tests/gl_manager.h b/gpu/command_buffer/tests/gl_manager.h
index 5dfd16abc0ff7ee5ece97229a7ec48852664cd43..2aa1728dffc95776bb4fc8bcad3f9abe09dd457f 100644
--- a/gpu/command_buffer/tests/gl_manager.h
+++ b/gpu/command_buffer/tests/gl_manager.h
@@ -44,6 +44,8 @@ class GLManager : private GpuControl {
     Options();
     // The size of the backbuffer.
     gfx::Size size;
+    // The amount of stencil buffer bits. Default is -1, no stencil buffer.
+    int stencil_size;
     // If not null will share resources with this context.
     GLManager* share_group_manager;
     // If not null will share a mailbox manager with this context.