Unit Test for WebView animating in and out of screen

android_webview/browser/browser_view_renderer.cc

Index: android_webview/browser/browser_view_renderer.cc
diff --git a/android_webview/browser/browser_view_renderer.cc b/android_webview/browser/browser_view_renderer.cc
index ea9d60312836a4a3c45dc9dd20850bf05028defd..24f0ce9a344af60c6d7b2d57a34f17663ce6514e 100644
--- a/android_webview/browser/browser_view_renderer.cc
+++ b/android_webview/browser/browser_view_renderer.cc
@@ -216,6 +216,12 @@ bool BrowserViewRenderer::OnDrawHardware() {
     return false;
   }
 
+  if (last_on_draw_global_visible_rect_.IsEmpty()) {
+    // WebView could be offscreen. Need to make sure WebView invalidates when
+    // it is animated into the screen again.
+    shared_renderer_state_.SetForceInvalidateOnNextDrawGLOnUI(true);
+  }
+
   ReturnResourceFromParent();
   if (shared_renderer_state_.HasCompositorFrameOnUI()) {
     TRACE_EVENT_INSTANT0("android_webview",
@@ -262,13 +268,9 @@ scoped_ptr<cc::CompositorFrame> BrowserViewRenderer::CompositeHw() {
     }
   }
 
-  scoped_ptr<cc::CompositorFrame> frame =
-      compositor_->DemandDrawHw(surface_size,
-                                gfx::Transform(),
-                                viewport,
-                                clip,
-                                viewport_rect_for_tile_priority,
-                                transform_for_tile_priority);
+  scoped_ptr<cc::CompositorFrame> frame = compositor_->DemandDrawHw(
+      surface_size, gfx::Transform(), viewport, clip,
+      viewport_rect_for_tile_priority, transform_for_tile_priority);
   if (frame.get())
     DidComposite();
   return frame.Pass();