PDF Viewer: Move controllers to a separate file

pdf_viewer.js is extremely long, and there is no reason the controllers
need to be in the same file with the PDF viewer class. This will also
simplify the process of closure compiling pdf_viewer.js, as handling
the dependencies between the viewer and the controllers and compiling
the controller portion of the code will be easier to separate from the
work to compile the rest of pdf_viewer.js.

Bug: 721073
Change-Id: Ife7a9fefd8a1a552fe5b15dbb747aaa0aa9b89b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793814Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695014}

chrome/browser/resources/component_extension_resources.grd

@@ -100,6 +100,7 @@
         <include name="IDR_PDF_INDEX_CSS" file="pdf/index.css" allowexternalscript="true" type="BINDATA" />
         <include name="IDR_PDF_MAIN_JS" file="pdf/main.js" type="BINDATA" />
         <include name="IDR_PDF_PDF_VIEWER_JS" file="pdf/pdf_viewer.js" type="BINDATA" />
+        <include name="IDR_PDF_CONTROLLER_JS" file="pdf/controller.js" type="BINDATA" />
         <include name="IDR_PDF_TOOLBAR_MANAGER_JS" file="pdf/toolbar_manager.js" type="BINDATA" />
         <include name="IDR_PDF_PDF_FITTING_TYPE_JS" file="pdf/pdf_fitting_type.js" type="BINDATA" />
         <include name="IDR_PDF_VIEWPORT_JS" file="pdf/viewport.js" type="BINDATA" />

chrome/browser/resources/pdf/index.html

@@ -58,6 +58,7 @@
 <script src="chrome://resources/js/promise_resolver.js"></script>
 <script src="browser_api.js"></script>
 <script src="metrics.js"></script>
+<script src="controller.js"></script>
 <script src="pdf_viewer.js"></script>
 <script src="main.js"></script>
 </html>

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

@@ -343,6 +343,7 @@ void SetupPrintPreviewPlugin(content::WebUIDataSource* source) {
     int id;
   } kPdfResources[] = {
     {"pdf/browser_api.js", IDR_PDF_BROWSER_API_JS},
+    {"pdf/controller.js", IDR_PDF_CONTROLLER_JS},
     {"pdf/elements/icons.html", IDR_PDF_ICONS_HTML},
     {"pdf/elements/shared-vars.html", IDR_PDF_SHARED_VARS_HTML},
     {"pdf/elements/viewer-bookmark/viewer-bookmark.html",