[vr] Exit VR mode when we encounter unsupported URLs

chrome/browser/android/vr_shell/textures/url_bar_texture.cc

Index: chrome/browser/android/vr_shell/textures/url_bar_texture.cc
diff --git a/chrome/browser/android/vr_shell/textures/url_bar_texture.cc b/chrome/browser/android/vr_shell/textures/url_bar_texture.cc
index 966d87728cf8e76482b4187a9fd056ac32947cae..8da35627fc0eaf5b6f746f0f31e54cc50369eaa0 100644
--- a/chrome/browser/android/vr_shell/textures/url_bar_texture.cc
+++ b/chrome/browser/android/vr_shell/textures/url_bar_texture.cc
@@ -252,13 +252,26 @@ void UrlBarTexture::RenderUrl(const gfx::Size& texture_size,
 
   std::unique_ptr<gfx::RenderText> render_text(
       gfx::RenderText::CreateInstance());
-  render_text->SetText(text);
   render_text->SetFontList(font_list);
   render_text->SetColor(SK_ColorBLACK);
   render_text->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-  render_text->SetDisplayRect(bounds);
   render_text->SetElideBehavior(gfx::TRUNCATE);
 
+  base::string16 mandatory_prefix = text;
+  int length = parsed.CountCharactersBefore(url::Parsed::PORT, false);
+  if (length > 0)
+    mandatory_prefix = text.substr(0, length);
+  gfx::Rect expanded_bounds = bounds;
+  expanded_bounds.set_width(2 * bounds.width());
+  render_text->SetDisplayRect(expanded_bounds);
+  render_text->SetText(mandatory_prefix);
+
+  if (render_text->GetStringSize().width() > bounds.width()) {
+    failure_callback_.Run(UiUnsupportedMode::kCouldNotElideURL);
+  }
+
+  render_text->SetText(text);
+  render_text->SetDisplayRect(bounds);
   vr_shell::RenderTextWrapper vr_render_text(render_text.get());
   ApplyUrlStyling(text, parsed, security_level_, &vr_render_text);