Move webcomponents.js polyfill to mocks (#8993)

* Move webcomponents.js polyfill to mocks

I'd like to move it out of shared to make it easier to sync this to RN.
Since this is only used for testing and a polyfill is essentially a mock.
Maybe this makes sense?

Rename to camel case to be consistent with providesModule.

* Update path to ignore in configs

.eslintignore

@@ -1,6 +1,6 @@
 # We can probably lint these later but not important at this point
 src/renderers/art
-src/shared/vendor
+src/__mocks__/vendor
 # But not in docs/_js/examples/*
 docs/_js/*.js
 docs/js/

gulpfile.js

@@ -39,7 +39,6 @@ var paths = {
 
       'src/ReactVersion.js',
       'src/shared/**/*.js',
-      '!src/shared/vendor/**/*.js',
       '!src/**/__benchmarks__/**/*.js',
       '!src/**/__tests__/**/*.js',
       '!src/**/__mocks__/**/*.js',
@@ -57,7 +56,6 @@ var paths = {
 
       'src/ReactVersion.js',
       'src/shared/**/*.js',
-      '!src/shared/vendor/**/*.js',
       '!src/**/__benchmarks__/**/*.js',
       '!src/**/__tests__/**/*.js',
       '!src/**/__mocks__/**/*.js',
@@ -71,7 +69,6 @@ var paths = {
 
       'src/ReactVersion.js',
       'src/shared/**/*.js',
-      '!src/shared/vendor/**/*.js',
       '!src/**/__benchmarks__/**/*.js',
       '!src/**/__tests__/**/*.js',
       '!src/**/__mocks__/**/*.js',
@@ -85,7 +82,6 @@ var paths = {
 
       'src/ReactVersion.js',
       'src/shared/**/*.js',
-      '!src/shared/vendor/**/*.js',
       '!src/**/__benchmarks__/**/*.js',
       '!src/**/__tests__/**/*.js',
       '!src/**/__mocks__/**/*.js',
@@ -99,7 +95,6 @@ var paths = {
 
       'src/ReactVersion.js',
       'src/shared/**/*.js',
-      '!src/shared/vendor/**/*.js',
       '!src/**/__benchmarks__/**/*.js',
       '!src/**/__tests__/**/*.js',
       '!src/**/__mocks__/**/*.js',

package.json

@@ -122,7 +122,7 @@
     ],
     "collectCoverageFrom": [
       "src/**/*.js",
-      "!src/shared/vendor/third_party/*.js",
+      "!src/__mocks__/vendor/third_party/*.js",
       "!src/test/*.js"
     ],
     "timers": "fake"