OOBE: Extract embedded video to separate resource

This change improves OOBE startup time for 0.8 sec in debug mode (~2%).

Bug: 1058022
Change-Id: I1a6a8780afc4a0c2e28759beb6faeaadaef547ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100807Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749751}

chrome/browser/browser_resources.grd

@@ -445,8 +445,14 @@
         <include name="IDR_OS_SETTINGS_SEARCH_MOJOM_LITE_JS" file="${root_gen_dir}\chrome\browser\ui\webui\settings\chromeos\search\search.mojom-lite.js" compress="gzip" use_base_dir="false" type="BINDATA" />
       </if>
       <if expr="chromeos">
+        <!-- OOBE / Login resources -->
         <include name="IDR_ASSISTANT_LOGO_PNG" file="resources\chromeos\assistant_optin\assistant_logo.png" type="BINDATA" />
         <include name="IDR_SUPERVISION_ICON_PNG" file="resources\chromeos\supervision\supervision_icon.png" type="BINDATA" />
+
+        <if expr="_google_chrome">
+          <!-- ARC Apps dowloading animation. -->
+          <include name="IDR_OOBE_ARC_APPS_DOWNLOADING_VIDEO" file="internal\resources\arc_support\videos\app_downloading.mp4" type="BINDATA" />
+        </if>
       </if>
       <if expr="safe_browsing_mode == 1">
         <include name="IDR_RESET_PASSWORD_HTML" file="resources\reset_password\reset_password.html" type="BINDATA" compress="gzip" />

chrome/browser/resources/chromeos/login/app_downloading.html

@@ -26,8 +26,7 @@
       <div id="app-downloading-video-container" slot="footer">
         <if expr="chromeos and _google_chrome">
           <video loop="loop" autoplay="autoplay" muted>
-            <source
-                src="../../../internal/resources/arc_support/videos/app_downloading.mp4"
+            <source src="chrome://oobe/res/arc_app_dowsnloading.mp4"
                 type="video/mp4">
           </video>
         </if>

chrome/browser/ui/webui/chromeos/login/oobe_ui.cc

@@ -141,6 +141,7 @@ constexpr char kRecommendAppListViewJSPath[] = "recommend_app_list_view.js";
 constexpr char kLogo24PX1XSvgPath[] = "logo_24px-1x.svg";
 constexpr char kLogo24PX2XSvgPath[] = "logo_24px-2x.svg";
 constexpr char kSyncConsentIcons[] = "sync-consent-icons.html";
+constexpr char kArcAppDownloadingVideoPath[] = "res/arc_app_dowsnloading.mp4";
 #endif
 
 // Adds various product logo resources.
@@ -179,6 +180,10 @@ void AddArcScreensResources(content::WebUIDataSource* source) {
                           IDR_ARC_SUPPORT_RECOMMEND_APP_LIST_VIEW_JS);
   source->AddResourcePath(kRecommendAppListViewHTMLPath,
                           IDR_ARC_SUPPORT_RECOMMEND_APP_LIST_VIEW_HTML);
+#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
+  source->AddResourcePath(kArcAppDownloadingVideoPath,
+                          IDR_OOBE_ARC_APPS_DOWNLOADING_VIDEO);
+#endif
 }
 
 void AddAssistantScreensResources(content::WebUIDataSource* source) {

content/browser/webui/web_ui_data_source_impl.cc

@@ -285,6 +285,9 @@ std::string WebUIDataSourceImpl::GetMimeType(const std::string& path) const {
   if (base::EndsWith(file_path, ".png", base::CompareCase::INSENSITIVE_ASCII))
     return "image/png";
 
+  if (base::EndsWith(file_path, ".mp4", base::CompareCase::INSENSITIVE_ASCII))
+    return "video/mp4";
+
   return "text/html";
 }