Port downloads.ItemView to a Polymer component.

ui/webui/resources/webui_resources.grd

Index: ui/webui/resources/webui_resources.grd
diff --git a/ui/webui/resources/webui_resources.grd b/ui/webui/resources/webui_resources.grd
index ee07cd768b0b84f6e26cbef9324c20dfa8c34d89..91e9a9d21c07cb2c55dad6d7d9a0bb4f14726c8c 100644
--- a/ui/webui/resources/webui_resources.grd
+++ b/ui/webui/resources/webui_resources.grd
@@ -271,6 +271,8 @@ without changes to the corresponding grd file. -->
                  file="js/cr/event_target.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_LINK_CONTROLLER"
                  file="js/cr/link_controller.js" type="chrome_html" />
+      <structure name="IDR_WEBUI_HTML_CR_UI"
+                 file="html/cr/ui.html" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI"
                  file="js/cr/ui.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_ALERT_OVERLAY"
@@ -287,6 +289,8 @@ without changes to the corresponding grd file. -->
                  file="js/cr/ui/bubble_button.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_CARD_SLIDER"
                  file="js/cr/ui/card_slider.js" type="chrome_html" />
+      <structure name="IDR_WEBUI_HTML_CR_UI_COMMAND"
+                 file="html/cr/ui/command.html" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_COMMAND"
                  file="js/cr/ui/command.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_CONTEXT_MENU_BUTTON"
@@ -372,17 +376,25 @@ without changes to the corresponding grd file. -->
                  file="js/cr/ui/touch_handler.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_EVENT_TRACKER"
                  file="js/event_tracker.js" type="chrome_html" />
+      <structure name="IDR_WEBUI_HTML_I18N_TEMPLATE"
+                 file="html/i18n_template.html" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_I18N_TEMPLATE_NO_PROCESS"
                  file="js/i18n_template_no_process.js"
                  type="chrome_html" />
+      <structure name="IDR_WEBUI_HTML_LOAD_TIME_DATA"
+                 file="html/load_time_data.html" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_LOAD_TIME_DATA"
                  file="js/load_time_data.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_MEDIA_COMMON"
                  file="js/media_common.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_PARSE_HTML_SUBSET"
                  file="js/parse_html_subset.js" type="chrome_html" />
+      <structure name="IDR_WEBUI_HTML_POLYMER_CONFIG"
+                 file="html/polymer_config.html" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_POLYMER_CONFIG"
                  file="js/polymer_config.js" type="chrome_html" />
+      <structure name="IDR_WEBUI_HTML_UTIL"
+                 file="html/util.html" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_UTIL"
                  file="js/util.js" type="chrome_html" flattenhtml="true" />
       <structure name="IDR_WEBUI_JS_WEBUI_RESOURCE_TEST"