Make sure the PDF material toolbar gets hidden after loading.

Currently the toolbar won't get hidden until after there is some user input.

Review URL: https://codereview.chromium.org/966293002

Cr-Commit-Position: refs/heads/master@{#318646}

chrome/browser/resources/pdf/pdf.js

@@ -447,6 +447,9 @@ PDFViewer.prototype = {
       });
       while (this.delayedScriptingMessages_.length > 0)
         this.handleScriptingMessage(this.delayedScriptingMessages_.shift());
+
+      if (this.isMaterial_)
+        this.uiManager_.hideUiAfterTimeout();
     }
   },
 

chrome/browser/resources/pdf/ui_manager.js

@@ -35,9 +35,7 @@ UiManager.prototype = {
     for (var i = 0; i < this.panes_.length; i++)
       this.panes_[i].showIfOpenedByUser();
 
-    if (this.uiTimeout_)
-      clearTimeout(this.uiTimeout_);
-    this.uiTimeout_ = setTimeout(this.hideUi_.bind(this), HIDE_TIMEOUT);
+    this.hideUiAfterTimeout();
   },
 
   /**
@@ -48,5 +46,14 @@ UiManager.prototype = {
     this.toolbar_.hide();
     for (var i = 0; i < this.panes_.length; i++)
       this.panes_[i].hideIfOpenedByUser();
+  },
+
+  /**
+   * Hide the toolbar after the HIDE_TIMEOUT has elapsed.
+   */
+  hideUiAfterTimeout: function() {
+    if (this.uiTimeout_)
+      clearTimeout(this.uiTimeout_);
+    this.uiTimeout_ = setTimeout(this.hideUi_.bind(this), HIDE_TIMEOUT);
   }
 };