Always focus the webview before sending it input

Bug: b/141992733
Test: None
Change-Id: Ia190abf893cb6dad03f6a0a1e0206b650b7da68f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841943
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702991}

chromecast/browser/webview/webview_controller.cc

@@ -216,6 +216,10 @@ void WebviewController::AttachTo(aura::Window* window, int window_id) {
 }
 
 void WebviewController::ProcessInputEvent(const webview::InputEvent& ev) {
+  // Ensure this web contents has focus before sending it input.
+  if (!contents_->GetNativeView()->HasFocus())
+    contents_->GetNativeView()->Focus();
+
   ui::EventHandler* handler = contents_->GetNativeView()->delegate();
   ui::EventType type = static_cast<ui::EventType>(ev.event_type());
   switch (type) {