Implement webview.captureVisibleRegion()

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index a15e0f08a8aab61a7346a4136e056af8cfc1a4a6..c7553f016cf824b0e7a5120adab9f2a30731f75c 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -1059,6 +1059,19 @@ bool WebContentsAddedObserver::RenderViewCreatedCalled() {
   return false;
 }
 
+void WaitForFirstFrame(WebContents* web_contents) {
+  RenderWidgetHostViewBase* rwhv_child = static_cast<RenderWidgetHostViewBase*>(
+      web_contents->GetRenderWidgetHostView());
+  // TODO(wjmaclean): Find a better way to avoid sleeping like this.
+  while (rwhv_child->RendererFrameNumber() <= 0) {
+    base::RunLoop run_loop;
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+        FROM_HERE, run_loop.QuitClosure(),
+        base::TimeDelta::FromMilliseconds(10));
+    run_loop.Run();
+  }
+}
+
 bool RequestFrame(WebContents* web_contents) {
   DCHECK(web_contents);
   return RenderWidgetHostImpl::From(