Added helper scripts for modifying polymer_resources.grdp.

ui/webui/resources/polymer_resources.grdp

 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  This file is generated.
+  Please use 'src/tools/polymer/polymer_grdp_to_txt.py' and
+  'src/tools/polymer/txt_to_polymer_grdp.py' to modify it, if possible.
+
+  'polymer_grdp_to_txt.py' converts 'polymer_resources.grdp' to a plane list of
+  used Polymer components:
+    ...
+    core-animation/core-animation.html
+    core-animation/web-animations.html
+    core-collapse/core-collapse-extracted.js
+    core-collapse/core-collapse.css
+    core-collapse/core-collapse.html
+    core-dropdown/core-dropdown-base-extracted.js
+    ...
+
+  'txt_to_polymer_grdp.py' converts list back to GRDP file.
+
+  Usage:
+    $ polymer_grdp_to_txt.py polymer_resources.grdp > /tmp/list.txt
+    $ vim /tmp/list.txt
+    $ txt_to_polymer_grdp.py /tmp/list.txt > polymer_resources.grdp
+-->
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@@ skipping 29 matching lines @@
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+  <structure name="IDR_POLYMER_CORE_DROPDOWN_CORE_DROPDOWN_BASE_EXTRACTED_JS"
+             file="../../../third_party/polymer/components-chromium/core-dropdown/core-dropdown-base-extracted.js"
+             type="chrome_html" />
+  <structure name="IDR_POLYMER_CORE_DROPDOWN_CORE_DROPDOWN_BASE_HTML"
+             file="../../../third_party/polymer/components-chromium/core-dropdown/core-dropdown-base.html"
+             type="chrome_html" />
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-  <structure name="IDR_POLYMER_CORE_DROPDOWN_CORE_DROPDOWN_BASE_HTML"
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-             file="../../../third_party/polymer/components-chromium/core-icon/core-icon.css"
+  <structure name="IDR_POLYMER_CORE_ICONSET_CORE_ICONSET_EXTRACTED_JS"
+             file="../../../third_party/polymer/components-chromium/core-iconset/core-iconset-extracted.js"
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-             file="../../../third_party/polymer/components-chromium/core-icon/core-icon-extracted.js"
+  <structure name="IDR_POLYMER_CORE_ICONSET_CORE_ICONSET_HTML"
+             file="../../../third_party/polymer/components-chromium/core-iconset/core-iconset.html"
              type="chrome_html" />
-  <structure name="IDR_POLYMER_CORE_ICON_CORE_ICON_HTML"
-             file="../../../third_party/polymer/components-chromium/core-icon/core-icon.html"
+  <structure name="IDR_POLYMER_CORE_ICONSET_SVG_CORE_ICONSET_SVG_EXTRACTED_JS"
+             file="../../../third_party/polymer/components-chromium/core-iconset-svg/core-iconset-svg-extracted.js"
+             type="chrome_html" />
+  <structure name="IDR_POLYMER_CORE_ICONSET_SVG_CORE_ICONSET_SVG_HTML"
+             file="../../../third_party/polymer/components-chromium/core-iconset-svg/core-iconset-svg.html"
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+  <structure name="IDR_POLYMER_CORE_ICON_CORE_ICON_CSS"
+             file="../../../third_party/polymer/components-chromium/core-icon/core-icon.css"
              type="chrome_html" />
-  <structure name="IDR_POLYMER_CORE_ICONSET_CORE_ICONSET_HTML"
-             file="../../../third_party/polymer/components-chromium/core-iconset/core-iconset.html"
+  <structure name="IDR_POLYMER_CORE_ICON_CORE_ICON_EXTRACTED_JS"
+             file="../../../third_party/polymer/components-chromium/core-icon/core-icon-extracted.js"
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-             type="chrome_html" />
-  <structure name="IDR_POLYMER_CORE_ICONSET_SVG_CORE_ICONSET_SVG_HTML"
-             file="../../../third_party/polymer/components-chromium/core-iconset-svg/core-iconset-svg.html"
+  <structure name="IDR_POLYMER_CORE_ICON_CORE_ICON_HTML"
+             file="../../../third_party/polymer/components-chromium/core-icon/core-icon.html"
              type="chrome_html" />
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   <structure name="IDR_POLYMER_CORE_LIST_CORE_LIST_CSS"
              file="../../../third_party/polymer/components-chromium/core-list/core-list.css"
              type="chrome_html" />
+  <structure name="IDR_POLYMER_CORE_LIST_CORE_LIST_CSS"
+             file="../../../third_party/polymer/components-chromium/core-list/core-list.css"
+             type="chrome_html" />
+  <structure name="IDR_POLYMER_CORE_LIST_CORE_LIST_CSS"
+             file="../../../third_party/polymer/components-chromium/core-list/core-list.css"
+             type="chrome_html" />
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@@ skipping 115 matching lines @@
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-             file="../../../third_party/polymer/components-chromium/paper-fab/paper-fab-extracted.js"
+  <structure name="IDR_POLYMER_PAPER_DROPDOWN_MENU_PAPER_DROPDOWN_MENU_CSS"
+             file="../../../third_party/polymer/components-chromium/paper-dropdown-menu/paper-dropdown-menu.css"
              type="chrome_html" />
-  <structure name="IDR_POLYMER_PAPER_FAB_PAPER_FAB_HTML"
-             file="../../../third_party/polymer/components-chromium/paper-fab/paper-fab.html"
+  <structure name="IDR_POLYMER_PAPER_DROPDOWN_MENU_PAPER_DROPDOWN_MENU_EXTRACTED_JS"
+             file="../../../third_party/polymer/components-chromium/paper-dropdown-menu/paper-dropdown-menu-extracted.js"
+             type="chrome_html" />
+  <structure name="IDR_POLYMER_PAPER_DROPDOWN_MENU_PAPER_DROPDOWN_MENU_HTML"
+             file="../../../third_party/polymer/components-chromium/paper-dropdown-menu/paper-dropdown-menu.html"
              type="chrome_html" />
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-             file="../../../third_party/polymer/components-chromium/paper-dropdown-menu/paper-dropdown-menu.css"
+  <structure name="IDR_POLYMER_PAPER_FAB_PAPER_FAB_EXTRACTED_JS"
+             file="../../../third_party/polymer/components-chromium/paper-fab/paper-fab-extracted.js"
              type="chrome_html" />
-  <structure name="IDR_POLYMER_PAPER_DROPDOWN_MENU_PAPER_DROPDOWN_MENU_EXTRACTED_JS"
-             file="../../../third_party/polymer/components-chromium/paper-dropdown-menu/paper-dropdown-menu-extracted.js"
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-             file="../../../third_party/polymer/components-chromium/paper-dropdown-menu/paper-dropdown-menu.html"
+  <structure name="IDR_POLYMER_PAPER_FAB_PAPER_FAB_HTML"
+             file="../../../third_party/polymer/components-chromium/paper-fab/paper-fab.html"
              type="chrome_html" />
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@@ skipping 38 matching lines @@
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+  <structure name="IDR_POLYMER_PAPER_TOGGLE_BUTTON_PAPER_TOGGLE_BUTTON_CSS"
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+             type="chrome_html" />
+  <structure name="IDR_POLYMER_PAPER_TOGGLE_BUTTON_PAPER_TOGGLE_BUTTON_EXTRACTED_JS"
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+             type="chrome_html" />
+  <structure name="IDR_POLYMER_PAPER_TOGGLE_BUTTON_PAPER_TOGGLE_BUTTON_HTML"
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+