Web UI: Add v0 HTML Imports Polyfill

This is needed so that pages using the polyfill will still work with
Polymer 1. Polymer 1 is currently tested on the bots and is expected
to be supported through at least M-74.

Bug: 925517
Change-Id: Iabe257fb1228dd9803403dd478889080bba64962
Reviewed-on: https://chromium-review.googlesource.com/c/1484506
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635888}

content/browser/webui/shared_resources_data_source.cc

@@ -52,6 +52,9 @@ const char kPolymerHtml[] = "polymer/v1_0/polymer/polymer.html";
 const char kPolymerJs[] = "polymer/v1_0/polymer/polymer-extracted.js";
 const char kPolymer2Html[] = "polymer/v1_0/polymer2/polymer.html";
 const char kPolymer2Js[] = "polymer/v1_0/polymer2/polymer-extracted.js";
+const char kHtmlImportsJs[] = "polymer/v1_0/html-imports/html-imports.min.js";
+const char kHtmlImportsV0Js[] =
+    "polymer/v1_0/html-imports-v0/html-imports.min.js";
 
 // Utility for determining if both Polymer 1 and Polymer 2 are needed.
 bool UsingMultiplePolymerVersions() {
@@ -83,6 +86,10 @@ const std::map<std::string, std::string> CreatePathPrefixAliasesMap() {
   if (base::FeatureList::IsEnabled(features::kWebUIPolymer2)) {
     aliases["../../../third_party/polymer/v1_0/components-chromium/polymer2/"] =
         "polymer/v1_0/polymer/";
+  } else {
+    aliases
+        ["../../../third_party/polymer/v1_0/components-chromium/"
+         "html-imports-v0/"] = "polymer/v1_0/html-imports/";
   }
 #endif  // !defined(OS_ANDROID)
   return aliases;
@@ -121,18 +128,26 @@ bool ShouldIgnore(std::string resource) {
 #endif  // defined(OS_CHROMEOS)
 
   if (base::FeatureList::IsEnabled(features::kWebUIPolymer2) &&
-      base::StartsWith(
-          resource,
-          "../../../third_party/polymer/v1_0/components-chromium/polymer/",
-          base::CompareCase::SENSITIVE)) {
+      (base::StartsWith(
+           resource,
+           "../../../third_party/polymer/v1_0/components-chromium/polymer/",
+           base::CompareCase::SENSITIVE) ||
+       base::StartsWith(resource,
+                        "../../../third_party/polymer/v1_0/components-chromium/"
+                        "html-imports-v0/",
+                        base::CompareCase::SENSITIVE))) {
     return true;
   }
 
   if (!base::FeatureList::IsEnabled(features::kWebUIPolymer2) &&
-      base::StartsWith(
-          resource,
-          "../../../third_party/polymer/v1_0/components-chromium/polymer2/",
-          base::CompareCase::SENSITIVE)) {
+      (base::StartsWith(
+           resource,
+           "../../../third_party/polymer/v1_0/components-chromium/polymer2/",
+           base::CompareCase::SENSITIVE) ||
+       base::StartsWith(resource,
+                        "../../../third_party/polymer/v1_0/components-chromium/"
+                        "html-imports/",
+                        base::CompareCase::SENSITIVE))) {
     return true;
   }
 
@@ -239,9 +254,14 @@ void SharedResourcesDataSource::StartDataRequest(
   // If this is a Polymer request and multiple Polymer versions are enabled,
   // return the Polymer 2 path unless the request is from the
   // |disabled_polymer2_host_|.
-  if ((path == kPolymerHtml || path == kPolymerJs) &&
-      UsingMultiplePolymerVersions() && !IsPolymer2DisabledForPage(wc_getter)) {
-    updated_path = path == kPolymerHtml ? kPolymer2Html : kPolymer2Js;
+  if ((path == kPolymerHtml || path == kPolymerJs || path == kHtmlImportsJs) &&
+      UsingMultiplePolymerVersions()) {
+    bool polymer2 = !IsPolymer2DisabledForPage(wc_getter);
+    if (polymer2 && (path == kPolymerHtml || path == kPolymerJs)) {
+      updated_path = path == kPolymerHtml ? kPolymer2Html : kPolymer2Js;
+    } else if (!polymer2 && path == kHtmlImportsJs) {
+      updated_path = kHtmlImportsV0Js;
+    }
   }
 #endif  // defined(OS_CHROMEOS)
 

third_party/polymer/v1_0/bower.json

@@ -4,6 +4,7 @@
   "dependencies": {
     "font-roboto": "PolymerElements/font-roboto#1.0.1",
     "html-imports": "webcomponents/html-imports#1.2.0",
+    "html-imports-v0": "webcomponents/html-imports#v0",
     "iron-a11y-announcer": "PolymerElements/iron-a11y-announcer#2.1.0",
     "iron-a11y-keys-behavior": "PolymerElements/iron-a11y-keys-behavior#2.1.1",
     "iron-a11y-keys": "PolymerElements/iron-a11y-keys#2.0.0",

third_party/polymer/v1_0/components-chromium/html-imports-v0/bower.json

+{
+  "name": "html-imports",
+  "main": "html-imports.min.js",
+  "version": "0.0.1",
+  "homepage": "http://webcomponents.org",
+  "authors": [
+    "The Polymer Authors"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/webcomponents/html-imports.git"
+  },
+  "keywords": [
+    "webcomponents"
+  ],
+  "license": "BSD",
+  "ignore": [],
+  "devDependencies": {
+    "web-component-tester": "^4.0.1",
+    "polymer": "2.0-preview"
+  }
+}

third_party/polymer/v1_0/components_summary.txt

@@ -10,6 +10,12 @@ Tree: v1.2.0
 Revision: bcdbb81201faad37270b03f59a29f2f27cb70312
 Tree link: https://github.com/webcomponents/html-imports/tree/v1.2.0
 
+Name: html-imports
+Repository: https://github.com/webcomponents/html-imports.git
+Tree: v0
+Revision: 5832a3028a3bb6f8f29f0c53b0c8d631efdfa0b4
+Tree link: https://github.com/webcomponents/html-imports/tree/v0
+
 Name: iron-a11y-announcer
 Repository: https://github.com/PolymerElements/iron-a11y-announcer.git
 Tree: v2.1.0

third_party/polymer/v1_0/find_unused_elements.py

@@ -31,6 +31,7 @@ class UnusedElementsDetector(object):
     'shadycss',
     # Not used yet. Will be used when pages are moved off of HTML imports.
     'html-imports',
+    'html-imports-v0',
   )
 
   def __init__(self):

third_party/polymer/v1_0/rsync_exclude.txt

@@ -28,6 +28,10 @@ package-lock.json
 */site/
 */templates/
 
+# html-imports-v0
+html-imports-v0/src/*
+html-imports-v0/gulpfile.js
+
 # iron-autogrow-textarea
 iron-autogrow-textarea/*
 

ui/webui/resources/polymer_resources.grdp

@@ -28,6 +28,10 @@
              file="../../../third_party/polymer/v1_0/components-chromium/html-imports/html-imports.min.js"
              type="chrome_html"
              compress="gzip" />
+  <structure name="IDR_POLYMER_1_0_HTML_IMPORTS_V0_HTML_IMPORTS_MIN_JS"
+             file="../../../third_party/polymer/v1_0/components-chromium/html-imports-v0/html-imports.min.js"
+             type="chrome_html"
+             compress="gzip" />
   <structure name="IDR_POLYMER_1_0_IRON_A11Y_ANNOUNCER_IRON_A11Y_ANNOUNCER_EXTRACTED_JS"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-a11y-announcer/iron-a11y-announcer-extracted.js"
              type="chrome_html"