Pass URL in page events

Webview clients want to know the URL for the page event. Include it for
convenience to reduce the number of IPCs.

Bug: b/132811925
Test: Compiled
Change-Id: I4d2b4fd7ead9002270f5008cb4bbfb5be57b3904
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833117Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701650}

chromecast/browser/webview/proto/webview.proto

@@ -93,6 +93,7 @@ message AsyncPageEvent {
   int32 stopped_error_code = 2;
   bool resource_load_failed = 3;
   bool did_first_visually_non_empty_paint = 4;
+  string url = 5;
 }
 
 message StopPageRequest {

chromecast/browser/webview/webview_controller.cc

@@ -335,6 +335,7 @@ void WebviewController::OnPageStateChanged(CastWebContents* cast_web_contents) {
     std::unique_ptr<webview::WebviewResponse> response =
         std::make_unique<webview::WebviewResponse>();
     auto* event = response->mutable_page_event();
+    event->set_url(contents_->GetURL().spec());
     event->set_current_page_state(current_state());
     client_->EnqueueSend(std::move(response));
   }
@@ -347,6 +348,7 @@ void WebviewController::OnPageStopped(CastWebContents* cast_web_contents,
     std::unique_ptr<webview::WebviewResponse> response =
         std::make_unique<webview::WebviewResponse>();
     auto* event = response->mutable_page_event();
+    event->set_url(contents_->GetURL().spec());
     event->set_current_page_state(current_state());
     event->set_stopped_error_code(error_code);
     client_->EnqueueSend(std::move(response));
@@ -361,6 +363,7 @@ void WebviewController::ResourceLoadFailed(CastWebContents* cast_web_contents) {
     std::unique_ptr<webview::WebviewResponse> response =
         std::make_unique<webview::WebviewResponse>();
     auto* event = response->mutable_page_event();
+    event->set_url(contents_->GetURL().spec());
     event->set_current_page_state(current_state());
     event->set_resource_load_failed(true);
     client_->EnqueueSend(std::move(response));