[iOS] Fix the tools menu button

Moves the tools menu button closer to the center of the toolbar to have
the same spacing between the border of the screen and the first/last
button.

Bug: 912965
Change-Id: I2d4c9860c4eb9ffd9a821a90384b8d588a3bbe89
Reviewed-on: https://chromium-review.googlesource.com/c/1481314
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635483}

ios/chrome/browser/ui/toolbar/secondary_toolbar_view.mm

@@ -19,6 +19,10 @@
 #error "This file requires ARC support."
 #endif
 
+namespace {
+const CGFloat kToolsMenuOffset = -7;
+}  // namespace
+
 @interface SecondaryToolbarView ()<ToolbarCollapsing>
 // Factory used to create the buttons.
 @property(nonatomic, strong) ToolbarButtonFactory* buttonFactory;
@@ -129,6 +133,11 @@
   self.tabGridButton = [self.buttonFactory tabGridButton];
   self.toolsMenuButton = [self.buttonFactory toolsMenuButton];
 
+  // Move the tools menu button such as it looks visually balanced with the
+  // button on the other side of the toolbar.
+  self.toolsMenuButton.transform =
+      CGAffineTransformMakeTranslation(kToolsMenuOffset, 0);
+
   self.allButtons = @[
     self.backButton, self.forwardButton, self.omniboxButton, self.tabGridButton,
     self.toolsMenuButton