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diff --git a/native/webview/plat_support/draw_gl.h b/native/webview/plat_support/draw_gl.h
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+++ b/native/webview/plat_support/draw_gl.h
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+// Copyright 2012 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.
+//
+//******************************************************************************
+// This is a copy of the coresponding android_webview/public/browser header.
+// Any changes to the interface should be made there.
+//
+// The purpose of having the copy is twofold:
+//  - it removes the need to have Chromium sources present in the tree in order
+//    to build the plat_support library,
+//  - it captures API that the corresponding Android release supports.
+//******************************************************************************
+
+#ifndef ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_GL_H_
+#define ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_GL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// 1 is L/L MR1
+//
+// 2 starts at M, and added an imperfect workaround for complex clipping by
+// elevating the WebView into an FBO layer. If any transform, clip, or outline
+// clip occurs that would either likely use the stencil buffer for clipping, or
+// require shader based clipping in HWUI, the WebView is drawn into an FBO (if
+// it fits).
+// This is a temporary workaround for a lack of WebView support for stencil/
+// shader based round rect clipping, and should be removed when webview is
+// capable of supporting these clips internally when drawing.
+//
+// 3 starts during development of P, when android defaults from HWUI to skia as
+// the GL renderer. Skia already maintains and restores its GL state, so there
+// is no need for WebView to restore this state. Skia also no longer promises
+// GL state on entering draw, such as no vertex array buffer binding.
+static const int kAwDrawGLInfoVersion = 3;
+
+// Holds the information required to trigger an OpenGL drawing operation.
+struct AwDrawGLInfo {
+  int version;  // The AwDrawGLInfo this struct was built with.
+
+  // Input: tells the draw function what action to perform.
+  enum Mode {
+    kModeDraw = 0,
+    kModeProcess,
+    kModeProcessNoContext,
+    kModeSync,
+  } mode;
+
+  // Input: current clip rect in surface coordinates. Reflects the current state
+  // of the OpenGL scissor rect. Both the OpenGL scissor rect and viewport are
+  // set by the caller of the draw function and updated during View animations.
+  int clip_left;
+  int clip_top;
+  int clip_right;
+  int clip_bottom;
+
+  // Input: current width/height of destination surface.
+  int width;
+  int height;
+
+  // Input: is the View rendered into an independent layer.
+  // If false, the surface is likely to hold to the full screen contents, with
+  // the scissor box set by the caller to the actual View location and size.
+  // Also the transformation matrix will contain at least a translation to the
+  // position of the View to render, plus any other transformations required as
+  // part of any ongoing View animation. View translucency (alpha) is ignored,
+  // although the framework will set is_layer to true for non-opaque cases.
+  // Can be requested via the View.setLayerType(View.LAYER_TYPE_NONE, ...)
+  // Android API method.
+  //
+  // If true, the surface is dedicated to the View and should have its size.
+  // The viewport and scissor box are set by the caller to the whole surface.
+  // Animation transformations are handled by the caller and not reflected in
+  // the provided transformation matrix. Translucency works normally.
+  // Can be requested via the View.setLayerType(View.LAYER_TYPE_HARDWARE, ...)
+  // Android API method.
+  bool is_layer;
+
+  // Input: current transformation matrix in surface pixels.
+  // Uses the column-based OpenGL matrix format.
+  float transform[16];
+};
+
+// Function to invoke a direct GL draw into the client's pre-configured
+// GL context. Obtained via AwContents.getDrawGLFunction() (static).
+// |view_context| is an opaque identifier that was returned by the corresponding
+// call to AwContents.getAwDrawGLViewContext().
+// |draw_info| carries the in and out parameters for this draw.
+// |spare| ignored; pass NULL.
+typedef void (AwDrawGLFunction)(long view_context,
+                                AwDrawGLInfo* draw_info,
+                                void* spare);
+enum AwMapMode {
+  MAP_READ_ONLY,
+  MAP_WRITE_ONLY,
+  MAP_READ_WRITE,
+};
+
+// Called to create a GraphicBuffer
+typedef long AwCreateGraphicBufferFunction(int w, int h);
+// Called to release a GraphicBuffer
+typedef void AwReleaseGraphicBufferFunction(long buffer_id);
+// Called to map a GraphicBuffer in |mode|.
+typedef int AwMapFunction(long buffer_id, AwMapMode mode, void** vaddr);
+// Called to unmap a GraphicBuffer
+typedef int AwUnmapFunction(long buffer_id);
+// Called to get a native buffer pointer
+typedef void* AwGetNativeBufferFunction(long buffer_id);
+// Called to get the stride of the buffer
+typedef unsigned int AwGetStrideFunction(long buffer_id);
+
+static const int kAwDrawGLFunctionTableVersion = 1;
+
+// Set of functions used in rendering in hardware mode
+struct AwDrawGLFunctionTable {
+  int version;
+  AwCreateGraphicBufferFunction* create_graphic_buffer;
+  AwReleaseGraphicBufferFunction* release_graphic_buffer;
+  AwMapFunction* map;
+  AwUnmapFunction* unmap;
+  AwGetNativeBufferFunction* get_native_buffer;
+  AwGetStrideFunction* get_stride;
+};
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_GL_H_