Gallery: Update edit-mode-applicavilities even if it's a instant auto…

… fix, and update them on undo/redo

BUG=591609
TEST=manually

Review URL: https://codereview.chromium.org/1766343002

Cr-Commit-Position: refs/heads/master@{#379703}

ui/file_manager/gallery/js/image_editor/image_editor.js

@@ -301,6 +301,7 @@ ImageEditor.prototype.undo = function() {
   this.leaveModeInternal_(false, false /* not to switch mode */);
   this.commandQueue_.undo();
   this.updateUndoRedo();
+  this.calculateModeApplicativity_();
 };
 
 /**
@@ -313,6 +314,7 @@ ImageEditor.prototype.redo = function() {
   this.leaveModeInternal_(false, false /* not to switch mode */);
   this.commandQueue_.redo();
   this.updateUndoRedo();
+  this.calculateModeApplicativity_();
 };
 
 /**
@@ -635,6 +637,7 @@ ImageEditor.prototype.setUpMode_ = function(mode) {
 
   this.currentMode_.setUp();
 
+  this.calculateModeApplicativity_();
   if (this.currentMode_.instant) {  // Instant tool.
     this.leaveModeInternal_(true, false /* not to switch mode */);
     return;
@@ -645,7 +648,6 @@ ImageEditor.prototype.setUpMode_ = function(mode) {
   this.modeToolbar_.clear();
   this.currentMode_.createTools(this.modeToolbar_);
   this.modeToolbar_.show(true);
-  this.calculateModeApplicativity_();
 };
 
 /**
@@ -809,6 +811,13 @@ ImageEditor.prototype.onDoubleTap_ = function(x, y) {
   }
 };
 
+/**
+ * Called when the user starts editing image.
+ */
+ImageEditor.prototype.onStartEditing = function() {
+  this.calculateModeApplicativity_();
+};
+
 /**
  * A helper object for panning the ImageBuffer.
  *

ui/file_manager/gallery/js/slide_mode.js

@@ -1643,6 +1643,7 @@ SlideMode.prototype.toggleEditor = function(opt_event) {
     }.bind(this));
 
     this.setSubMode_(Gallery.SubMode.EDIT);
+    this.editor_.onStartEditing();
   } else {
     this.editor_.getPrompt().hide();
     this.editor_.leaveMode(false /* not to switch mode */);