1 files changed, 10 insertions, 1 deletions
diff --git a/src/image/SkSurface_Base.h b/src/image/SkSurface_Base.h
index 1b0f9ff975..264a86fc9d 100644
--- a/src/image/SkSurface_Base.h
+++ b/src/image/SkSurface_Base.h
@@ -77,8 +77,17 @@ public:
 
     /**
      * Issue any pending surface IO to the current backend 3D API and resolve any surface MSAA.
+     * Inserts the requested number of semaphores for the gpu to signal when work is complete on the
+     * gpu and inits the array of GrBackendSemaphores with the signaled semaphores.
      */
-    virtual void onPrepareForExternalIO() {}
+    virtual void onFlush(int numSemaphores, GrBackendSemaphore* signalSemaphores) {}
+
+    /**
+     * Caused the current backend 3D API to wait on the passed in semaphores before executing new
+     * commands on the gpu. Any previously submitting commands will not be blocked by these
+     * semaphores.
+     */
+    virtual void onWait(int numSemaphores, const GrBackendSemaphore* waitSemaphores) {}
 
     inline SkCanvas* getCachedCanvas();
     inline sk_sp<SkImage> refCachedImage();