Refactor build boot process

Move loader and flag parsing out of "if shadowdom polyfill" branch code

This change makes the "native" build possible

Author: dfreedm

build-native.json

@@ -1,4 +1,5 @@
 [
+  "build/boot.js",
   "src/patches-shadowdom-native.js",
 
   "src/lang.js",

build.json

@@ -1,4 +1,5 @@
 [
+  "build/boot.js",
   "../WeakMap/weakmap.js",
   "../observe-js/src/observe.js",
   "build/if-poly.js",

build/boot.js

@@ -0,0 +1,67 @@
+/**
+ * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+ * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+ * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+ * Code distributed by Google as part of the polymer project is also
+ * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+
+window.Platform = window.Platform || {};
+// prepopulate window.logFlags if necessary
+window.logFlags = window.logFlags || {};
+// process flags
+(function(scope){
+  // import
+  var flags = scope.flags || {};
+  // populate flags from location
+  location.search.slice(1).split('&').forEach(function(o) {
+    o = o.split('=');
+    o[0] && (flags[o[0]] = o[1] || true);
+  });
+  var entryPoint = document.currentScript ||
+      document.querySelector('script[src*="platform.js"]');
+  if (entryPoint) {
+    var a = entryPoint.attributes;
+    for (var i = 0, n; i < a.length; i++) {
+      n = a[i];
+      if (n.name !== 'src') {
+        flags[n.name] = n.value || true;
+      }
+    }
+  }
+  if (flags.log) {
+    flags.log.split(',').forEach(function(f) {
+      window.logFlags[f] = true;
+    });
+  }
+  // If any of these flags match 'native', then force native ShadowDOM; any
+  // other truthy value, or failure to detect native
+  // ShadowDOM, results in polyfill
+  flags.shadow = flags.shadow || flags.shadowdom || flags.polyfill;
+  if (flags.shadow === 'native') {
+    flags.shadow = false;
+  } else {
+    flags.shadow = flags.shadow || !HTMLElement.prototype.createShadowRoot;
+  }
+
+  if (flags.shadow && document.querySelectorAll('script').length > 1) {
+    console.warn('platform.js is not the first script on the page. ' +
+        'See http://www.polymer-project.org/docs/start/platform.html#setup ' +
+        'for details.');
+  }
+
+  // CustomElements polyfill flag
+  if (flags.register) {
+    window.CustomElements = window.CustomElements || {flags: {}};
+    window.CustomElements.flags.register = flags.register;
+  }
+
+  if (flags.imports) {
+    window.HTMLImports = window.HTMLImports || {flags: {}};
+    window.HTMLImports.flags.imports = flags.imports;
+  }
+
+  // export
+  scope.flags = flags;
+})(Platform);

build/if-poly.js

@@ -1,62 +1,2 @@
-// prepoulate window.Platform.flags for default controls
-window.Platform = window.Platform || {};
-// prepopulate window.logFlags if necessary
-window.logFlags = window.logFlags || {};
-// process flags
-(function(scope){
-  // import
-  var flags = scope.flags || {};
-  // populate flags from location
-  location.search.slice(1).split('&').forEach(function(o) {
-    o = o.split('=');
-    o[0] && (flags[o[0]] = o[1] || true);
-  });
-  var entryPoint = document.currentScript ||
-      document.querySelector('script[src*="platform.js"]');
-  if (entryPoint) {
-    var a = entryPoint.attributes;
-    for (var i = 0, n; i < a.length; i++) {
-      n = a[i];
-      if (n.name !== 'src') {
-        flags[n.name] = n.value || true;
-      }
-    }
-  }
-  if (flags.log) {
-    flags.log.split(',').forEach(function(f) {
-      window.logFlags[f] = true;
-    });
-  }
-  // If any of these flags match 'native', then force native ShadowDOM; any
-  // other truthy value, or failure to detect native
-  // ShadowDOM, results in polyfill
-  flags.shadow = flags.shadow || flags.shadowdom || flags.polyfill;
-  if (flags.shadow === 'native') {
-    flags.shadow = false;
-  } else {
-    flags.shadow = flags.shadow || !HTMLElement.prototype.createShadowRoot;
-  }
-
-  if (flags.shadow && document.querySelectorAll('script').length > 1) {
-    console.warn('platform.js is not the first script on the page. ' +
-        'See http://www.polymer-project.org/docs/start/platform.html#setup ' +
-        'for details.');
-  }
-
-  // CustomElements polyfill flag
-  if (flags.register) {
-    window.CustomElements = window.CustomElements || {flags: {}};
-    window.CustomElements.flags.register = flags.register;
-  }
-
-  if (flags.imports) {
-    window.HTMLImports = window.HTMLImports || {flags: {}};
-    window.HTMLImports.flags.imports = flags.imports;
-  }
-
-  // export
-  scope.flags = flags;
-})(Platform);
-
 // select ShadowDOM impl
 if (Platform.flags.shadow) {