Encode frame number in pixel data for pose sync

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 521 matching lines @@
 
     // Restore as soon as possible, but only when
     // the canvas is visible.
     Auto
   };
   void loseContext(LostContextMode) override;
   void forceLostContext(LostContextMode, AutoRecoveryMethod);
   void forceRestoreContext();
   void loseContextImpl(LostContextMode, AutoRecoveryMethod);
 
+  // Utilities to restore GL state to match the rendering context's
+  // saved state. Use these after contextGL()-based state changes that
+  // bypass the rendering context.
+  void restoreScissorEnabled();
+  void restoreScissorBox();
+  void restoreClearColor();
+  void restoreClearDepthf();
+  void restoreClearStencil();
+  void restoreStencilMaskSeparate();
+  void restoreColorMask();
+  void restoreDepthMask();
+
   gpu::gles2::GLES2Interface* contextGL() const {
     DrawingBuffer* d = drawingBuffer();
     if (!d)
       return nullptr;
     return d->contextGL();
   }
   WebGLContextGroup* contextGroup() const { return m_contextGroup.get(); }
   Extensions3DUtil* extensionsUtil();
 
   void reshape(int width, int height) override;
@@ skipping 202 matching lines @@
   GLenum m_readBufferOfDefaultFramebuffer;
 
   GLint m_packAlignment;
   GLint m_unpackAlignment;
   bool m_unpackFlipY;
   bool m_unpackPremultiplyAlpha;
   GLenum m_unpackColorspaceConversion;
 
   GLfloat m_clearColor[4];
   bool m_scissorEnabled;
+  GLint m_scissorBox[4];
   GLfloat m_clearDepth;
   GLint m_clearStencil;
   GLboolean m_colorMask[4];
   GLboolean m_depthMask;
 
   bool m_stencilEnabled;
   GLuint m_stencilMask, m_stencilMaskBack;
   GLint m_stencilFuncRef,
       m_stencilFuncRefBack;  // Note that these are the user specified values, not the internal clamped value.
   GLuint m_stencilFuncMask, m_stencilFuncMaskBack;
@@ skipping 736 matching lines @@
                   context,
                   context->is3d(),
                   context.is3d());
 
 }  // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(
     blink::WebGLRenderingContextBase::TextureUnitState);
 
 #endif  // WebGLRenderingContextBase_h