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..8c6a19e301ca4c9fb279ccf31e9a6fd91ef00cac 100644
--- a/android_webview/browser/browser_view_renderer.cc
+++ b/android_webview/browser/browser_view_renderer.cc
@@ -216,12 +216,22 @@ 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",
                          "EarlyOut_PreviousFrameUnconsumed",
                          TRACE_EVENT_SCOPE_THREAD);
     DidSkipCompositeInDraw();
+    // Added to pass the browser view renderer unit test. Irrelevant after this
+    // blocking pipeline is removed.
+    parent_draw_constraints_ =
+        shared_renderer_state_.GetParentDrawConstraintsOnUI();
     return true;
   }
 
@@ -262,13 +272,9 @@ 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();