Rework FlushSync to return early if commands have been processed since the last update

gpu/pgl/pgl.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef GPU_PGL_PGL_H
-#define GPU_PGL_PGL_H
-
-#include <npapi.h>
-#include <npapi_extensions.h>
-
-#define PGL_TRUE          1
-#define PGL_FALSE         0
-
-#define PGL_NO_CONTEXT    ((PGLContext) 0)
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef void* PGLContext;
-typedef unsigned int PGLBoolean;
-typedef int32_t PGLInt;
-
-// These are the same error codes as used by EGL.
-enum {
-  PGL_SUCCESS             = 0x3000,
-  PGL_NOT_INITIALIZED     = 0x3001,
-  PGL_BAD_CONTEXT         = 0x3006,
-  PGL_BAD_PARAMETER       = 0x300C,
-  PGL_CONTEXT_LOST        = 0x300E
-};
-
-// Initialize the PGL library. This must have completed before any other PGL
-// functions are invoked.
-PGLBoolean pglInitialize();
-
-// Terminate the PGL library. This must be called after any other PGL functions
-// have completed.
-PGLBoolean pglTerminate();
-
-// Create A PGL context from a Pepper 3D device context.
-PGLContext pglCreateContext(NPP npp,
-                            NPDevice* device,
-                            NPDeviceContext3D* device_context);
-
-// Set the current PGL context for the calling thread.
-PGLBoolean pglMakeCurrent(PGLContext pgl_context);
-
-// Get the calling thread's current PGL context.
-PGLContext pglGetCurrentContext(void);
-
-// Gets the address of a function.
-void (*pglGetProcAddress(char const * procname))();
-
-// Display everything that has been rendered since the last call.
-PGLBoolean pglSwapBuffers(void);
-
-// Destroy the given PGL context.
-PGLBoolean pglDestroyContext(PGLContext pgl_context);
-
-// Return the current PGL error.
-PGLInt pglGetError();
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-
-#endif  // GPU_PGL_PGL_H