Unit Test for WebView animating in and out of screen

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 ffc15b65aac333281d136875f71420458de27e11..4c2f36f7acc48b7cf301e90f409014be3fd4c1bf 100644
--- a/android_webview/browser/browser_view_renderer_client.h
+++ b/android_webview/browser/browser_view_renderer_client.h
@@ -11,6 +11,7 @@
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace android_webview {
+struct ParentCompositorDrawConstraints;
 
 class BrowserViewRendererClient {
  public:
@@ -54,6 +55,12 @@ class BrowserViewRendererClient {
   // Handle overscroll.
   virtual void DidOverscroll(gfx::Vector2d overscroll_delta) = 0;
 
+  // Visible for testing
+  // Called when the parent draw constraints in browser view renderer gets
+  // updated.
+  virtual void ParentDrawConstraintsUpdated(
+      const ParentCompositorDrawConstraints& draw_constraints) = 0;
+
  protected:
   virtual ~BrowserViewRendererClient() {}
 };