[vr] Exit VR mode when we encounter unsupported URLs

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/textures/url_bar_texture.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "cc/paint/skia_paint_canvas.h"
 #include "chrome/browser/android/vr_shell/textures/render_text_wrapper.h"
 #include "components/url_formatter/url_formatter.h"
@@ skipping 234 matching lines @@
       &parsed, nullptr, nullptr);
 
   int pixel_font_height = texture_size.height() * kFontHeight / kHeight;
 
   gfx::FontList font_list;
   if (!GetFontList(pixel_font_height, text, &font_list))
     failure_callback_.Run(UiUnsupportedMode::kUnhandledCodePoint);
 
   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);
 
+  const base::string16 mandatory_prefix = text.substr(0, parsed.host.end());
+  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);

[cjgrant, 2017/05/29 15:17:13]

Just checking that you still want to proceed and render the long URL, rather
than leaving the field blank.  I think this is the right thing to do.

+  render_text->SetDisplayRect(bounds);
   vr_shell::RenderTextWrapper vr_render_text(render_text.get());
   ApplyUrlStyling(text, parsed, security_level_, &vr_render_text);
 
   url_render_text_ = std::move(render_text);
 }
 
 // This method replicates behavior in OmniboxView::UpdateTextStyle(), and
 // attempts to maintain similar code structure.
 void UrlBarTexture::ApplyUrlStyling(
     const base::string16& formatted_url,
@@ skipping 59 matching lines @@
 
 gfx::Size UrlBarTexture::GetPreferredTextureSize(int maximum_width) const {
   return gfx::Size(maximum_width, maximum_width * kHeight / kWidth);
 }
 
 gfx::SizeF UrlBarTexture::GetDrawnSize() const {
   return size_;
 }
 
 }  // namespace vr_shell