Unit Test for WebView animating in and out of screen

android_webview/browser/hardware_renderer.cc

Index: android_webview/browser/hardware_renderer.cc
diff --git a/android_webview/browser/hardware_renderer.cc b/android_webview/browser/hardware_renderer.cc
index dc83b1be1700d0fa9d1632443d3ed99b1df3f464..0184945a1925213f74159f34b65b34806d3b60b1 100644
--- a/android_webview/browser/hardware_renderer.cc
+++ b/android_webview/browser/hardware_renderer.cc
@@ -220,6 +220,7 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
   transform.matrix().setColMajorf(draw_info->transform);
   transform.Translate(scroll_offset_.x(), scroll_offset_.y());
 
+  viewport_.SetSize(draw_info->width, draw_info->height);
   // Need to post the new transform matrix back to child compositor
   // because there is no onDraw during a Render Thread animation, and child
   // compositor might not have the tiles rasterized as the animation goes on.
@@ -233,7 +234,6 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
   if (!delegated_layer_.get())
     return;
 
-  viewport_.SetSize(draw_info->width, draw_info->height);
   layer_tree_host_->SetViewportSize(viewport_);
   clip_.SetRect(draw_info->clip_left,
                 draw_info->clip_top,