aw: Bump draw_gl.h version

android_webview/public/browser/draw_gl.h

 // 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.
 
 #ifndef ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_GL_H_
 #define ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_GL_H_
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-static const int kAwDrawGLInfoVersion = 1;
+
+// 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.
+static const int kAwDrawGLInfoVersion = 2;
 
 // 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,
@@ skipping 74 matching lines @@
   AwUnmapFunction* unmap;
   AwGetNativeBufferFunction* get_native_buffer;
   AwGetStrideFunction* get_stride;
 };
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_GL_H_