Implement external stencil for Android WebView

Add an OutputSurface::ApplyExternalStencil method.
Android WebView implements this method on the render thread
and applies the stencil parameters read in functor, through
the command buffer client.

BUG=574570
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1564703005

Cr-Commit-Position: refs/heads/master@{#368468}

1 files changed, 6 insertions, 1 deletions

diff --git a/android_webview/browser/parent_output_surface.h b/android_webview/browser/parent_output_surface.h
index 0467f2a..f69598e 100644
--- a/android_webview/browser/parent_output_surface.h
+++ b/android_webview/browser/parent_output_surface.h
@@ -5,6 +5,7 @@
 #ifndef ANDROID_WEBVIEW_BROWSER_PARENT_OUTPUT_SURFACE_H_
 #define ANDROID_WEBVIEW_BROWSER_PARENT_OUTPUT_SURFACE_H_
 
+#include "android_webview/browser/scoped_app_gl_state_restore.h"
 #include "base/macros.h"
 #include "cc/output/output_surface.h"
 
@@ -22,9 +23,13 @@ class ParentOutputSurface : NON_EXPORTED_BASE(public cc::OutputSurface) {
                float scale_factor,
                bool has_alpha) override;
   void SwapBuffers(cc::CompositorFrame* frame) override;
-  using cc::OutputSurface::SetExternalStencilTest;
+  void ApplyExternalStencil() override;
+
+  void SetGLState(const ScopedAppGLStateRestore& gl_state);
 
  private:
+  StencilState stencil_state_;
+
   DISALLOW_COPY_AND_ASSIGN(ParentOutputSurface);
 };