OffscreenPreRaster and its plumbings

android_webview/browser/browser_view_renderer.h

Index: android_webview/browser/browser_view_renderer.h
diff --git a/android_webview/browser/browser_view_renderer.h b/android_webview/browser/browser_view_renderer.h
index e47104936c96b0c63e915e74c37364275227d8c0..9027564c72a6670b7c336faf381a0e75e148844f 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -55,6 +55,8 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
 
   void ClearView();
 
+  void SetOffscreenPreRaster(bool enabled);
+
   // View update notifications.
   void SetIsPaused(bool paused);
   void SetViewVisibility(bool visible);
@@ -158,6 +160,8 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
   bool on_new_picture_enable_;
   bool clear_view_;
 
+  bool offscreen_pre_raster_;
+
   gfx::Vector2d last_on_draw_scroll_offset_;
   gfx::Rect last_on_draw_global_visible_rect_;