Cleanup Tool WebUI: Add functional HTML and skeleton JS for main content

chrome/browser/browser_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1" output_all_resource_defines="false">
   <outputs>
     <output filename="grit/browser_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="browser_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
     <structures>
       <if expr="enable_app_list">
         <structure name="IDR_APP_LIST_START_PAGE_CSS" file="resources\app_list\start_page.css" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_APP_LIST_START_PAGE_HTML" file="resources\app_list\start_page.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_APP_LIST_START_PAGE_JS" file="resources\app_list\start_page.js" flattenhtml="true" type="chrome_html" />
       </if>
       <if expr="is_win">
         <structure name="IDR_CLEANUP_TOOL_HTML"
         file="resources\cleanup_tool\cleanup.html" type="chrome_html" />
         <structure name="IDR_CLEANUP_TOOL_BROWSER_PROXY_HTML"
         file="resources\cleanup_tool\cleanup_browser_proxy.html" type="chrome_html" />
         <structure name="IDR_CLEANUP_TOOL_BROWSER_PROXY_JS"
         file="resources\cleanup_tool\cleanup_browser_proxy.js" type="chrome_html" />
+        <structure name="IDR_CLEANUP_TOOL_ICONS_HTML"
+        file="resources\cleanup_tool\icons.html" type="chrome_html" />
+        <structure name="IDR_CLEANUP_TOOL_MANAGER_HTML"
+        file="resources\cleanup_tool\manager.html" type="chrome_html" />
+        <structure name="IDR_CLEANUP_TOOL_MANAGER_JS"
+        file="resources\cleanup_tool\manager.js" type="chrome_html" />
         <structure name="IDR_CLEANUP_TOOL_TOOLBAR_HTML"
         file="resources\cleanup_tool\toolbar.html" type="chrome_html" />
         <structure name="IDR_CLEANUP_TOOL_TOOLBAR_JS"
         file="resources\cleanup_tool\toolbar.js" type="chrome_html" />
       </if>
       <if expr="enable_extensions">
         <structure name="IDR_EXTENSIONS_HTML" file="resources\extensions\extensions.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_MD_EXTENSIONS_EXTENSIONS_HTML" file="resources\md_extensions\extensions.html" flattenhtml="true" allowexternalscript="true" type="chrome_html" />
       </if>
       <if expr="chromeos">
@@ skipping 627 matching lines @@
         <include name="IDR_WELCOME_WIN10_DEFAULT_SMALL_WEBP" file="resources\welcome\win10\default-small.webp" type="BINDATA" />
         <include name="IDR_WELCOME_WIN10_PIN_LARGE_WEBP" file="resources\welcome\win10\pin-large.webp" type="BINDATA" />
         <include name="IDR_WELCOME_WIN10_PIN_SMALL_WEBP" file="resources\welcome\win10\pin-small.webp" type="BINDATA" />
       </if>
       <if expr="not is_android and not is_ios">
         <include name="IDR_SSL_ERROR_ASSISTANT_PB" file="${root_gen_dir}/chrome/browser/resources/ssl/ssl_error_assistant/ssl_error_assistant.pb" use_base_dir="false" type="BINDATA" />
       </if>
     </includes>
   </release>
 </grit>