Add synchronous requestDrawGL

android_webview/browser/browser_view_renderer_client.h

Index: android_webview/browser/browser_view_renderer_client.h
diff --git a/android_webview/browser/browser_view_renderer_client.h b/android_webview/browser/browser_view_renderer_client.h
index 382ce0d8f8f330d86ba50d314ddc12be9907fd48..7359cd3df2cf5f41dc1c2381bb04ce429287428d 100644
--- a/android_webview/browser/browser_view_renderer_client.h
+++ b/android_webview/browser/browser_view_renderer_client.h
@@ -15,9 +15,11 @@ namespace android_webview {
 class BrowserViewRendererClient {
  public:
   // Request DrawGL be called. Passing null |canvas| implies the request
-  // will be of AwDrawGLInfo::kModeProcess type. The callback
-  // may never be made, and the mode may be promoted to kModeDraw.
-  virtual bool RequestDrawGL(jobject canvas) = 0;
+  // will be of AwDrawGLInfo::kModeProcess type. |wait_for_completion|
+  // will cause the call to block until DrawGL has happened; it does not
+  // together with |canvas|. The callback may never be made, and the mode may

[hush (inactive), 2014/05/01 00:35:54]

do you mean |wait_for_completion| should not be true if the canvas is not null?

[boliu, 2014/05/01 00:46:36]

Yes. Fixed up comment.

+  // be promoted to kModeDraw.
+  virtual bool RequestDrawGL(jobject canvas, bool wait_for_completion) = 0;
 
   // Called when a new Picture is available. Needs to be enabled
   // via the EnableOnNewPicture method.