Update prebuilts to go1.9rc2 ab/4258011

Test: m blueprint_tools
Change-Id: I93fedac0dc439808b36a4603dffcd436c2dbb452
diff --git a/doc/editors.html b/doc/editors.html
index 1448781..264f5af 100644
--- a/doc/editors.html
+++ b/doc/editors.html
@@ -19,11 +19,12 @@
 </p>
 
 <ul>
-<li><a href="https://github.com/fatih/vim-go">Vim Go</a>: a plugin for Vim to provide Go programming language support</li>
-<li><a href="https://marketplace.visualstudio.com/items?itemName=lukehoban.Go">Visual Studio Code Go</a>:
-an extension for Visual Studio Code to provide support for the Go programming language</li>
+<li><a href="https://github.com/fatih/vim-go">vim</a>: vim-go plugin provides Go programming language support</li>
+<li><a href="https://marketplace.visualstudio.com/items?itemName=lukehoban.Go">Visual Studio Code</a>:
+Go extension provides support for the Go programming language</li>
 <li><a href="https://www.jetbrains.com/go">Gogland</a>: Gogland is distributed either as a standalone IDE
-or as a plugin for the IntelliJ Platform IDEs</li>
+or as a plugin for the commercial IntelliJ Platform IDEs</li>
+<li><a href="https://atom.io/packages/go-plus">Atom</a>: Go-Plus is an Atom package that provides enhanced Go support</li>
 </ul>
 
 <p>
@@ -41,133 +42,155 @@
 <table class="features-matrix">
   <tr>
     <th></th>
-    <th><img title="Vim Go" src="/doc/editors/vimgo.png"><br>Vim Go</th>
-    <th><img title="Visual Studio Code" src="/doc/editors/vscodego.png"><br>Visual Studio Code Go</th>
+    <th><img title="Vim Go" src="/doc/editors/vimgo.png"><br>vim</th>
+    <th><img title="Visual Studio Code" src="/doc/editors/vscodego.png"><br>Visual Studio Code</th>
     <th><img title="Gogland" src="/doc/editors/gogland.png"><br>Gogland</th>
+    <th><img title="Go-Plus" src="/doc/editors/go-plus.png"><br>Atom</th>
   </tr>
   <tr>
-    <td class="feature-row" colspan="4">Editing features</td>
+    <td class="feature-row" colspan="5">Editing features</td>
   </tr>
   <tr>
     <td>Build and run from the editor/IDE</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
     <td>Autocompletion of identifers (variable, method, and function names)</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
-  </tr>
-  <tr>
-    <td>Autocompletion based on type</td>
-    <td class="no">No</td>
-    <td class="no">No</td>
     <td class="yes">Yes</td>
   </tr>
   <tr>
+    <td>Type-aware autocompletion</td>
+    <td class="no">No</td>
+    <td class="no">No</td>
+    <td class="yes">Yes</td>
+    <td class="no">No</td>
+  </tr>
+  <tr>
     <td>Rename identifiers</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
     <td>Auto format, build, vet, and lint on save</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes<sup>1</sup></td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
     <td>Auto insert import paths and remove unused on save</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes<sup>2</sup></td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
     <td>Auto generate JSON, XML tags for struct fields</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
-    <td class="feature-row" colspan="4">Navigation features</td>
+    <td class="feature-row" colspan="5">Navigation features</td>
   </tr>
   <tr>
     <td>Display documentation inline, or open godoc in browser</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
     <td>Switch between <code>*.go</code> and <code>*_test.go</code> file</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">No</td>
   </tr>
   <tr>
     <td>Jump to definition and referees</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
     <td>Look up for interface implementations</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
     <td>Search for callers and callees</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr>
-    <td class="feature-row" colspan="4">Testing and debugging features</td>
+    <td class="feature-row" colspan="5">Testing and debugging features</td>
   </tr>
   <tr>
     <td>Debugger support</td>
     <td class="no">No</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes<sup>3</sup></td>
+
   </tr>
   <tr>
     <td>Run a single test case, all tests from file, or all tests from a package</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="no">No</td>
   </tr>
   <tr>
     <td>Auto generate tests for packages, files and identifiers</td>
     <td class="no">No</td>
     <td class="yes">Yes</td>
     <td class="no">No</td>
+    <td class="no">No</td>
   </tr>
   <tr>
     <td>Debug tests</td>
     <td class="no">No</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes<sup>3</sup></td>
   </tr>
   <tr>
     <td>Display test coverage</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
     <td class="yes">Yes</td>
+    <td class="yes">Yes</td>
   </tr>
   <tr class="download">
     <td></td>
     <td><a href="https://github.com/fatih/vim-go">Install<a/></td>
     <td><a href="https://marketplace.visualstudio.com/items?itemName=lukehoban.Go">Install<a/></td>
     <td><a href="https://www.jetbrains.com/go">Install<a/></td>
+    <td><a href="https://atom.io/packages/go-plus">Install</a></td>
   </tr>
 </table>
 
 <p>
-<sup>1</sup>: Possible when enabled via Settings &gt; Go &gt; On Save, <code>go</code> <code>vet</code> and <code>golint</code> are available via plugins. Also runs tests on save if configured.
+<sup>1</sup>Possible when enabled via Settings &gt; Go &gt; On Save, <code>go</code> <code>vet</code> and <code>golint</code> are available via plugins. Also runs tests on save if configured.
 <br>
-<sup>2</sup>: Additionally, user input can disambiguate when two or more options are available.
+<sup>2</sup>Additionally, user input can disambiguate when two or more options are available.
+<br>
+<sup>3</sup>Available if the <a href="https://atom.io/packages/go-debug">go-debug</a> package is installed.
 </p>
 
 </div>
@@ -206,5 +229,3 @@
   font-weight: bold;
 }
 </style>
-
-<!--TODO(jbd): Add the Atom comparison-->
\ No newline at end of file