Enhance the material design ripple API so the ripple's state can be controlled by it's owning View.

chrome/browser/ui/views/toolbar/back_button.cc

Index: chrome/browser/ui/views/toolbar/back_button.cc
diff --git a/chrome/browser/ui/views/toolbar/back_button.cc b/chrome/browser/ui/views/toolbar/back_button.cc
index 54c6f2f988420906f69c52044461e5474815a742..73ae0411c64c06f374cbaab0be52536da6b57451 100644
--- a/chrome/browser/ui/views/toolbar/back_button.cc
+++ b/chrome/browser/ui/views/toolbar/back_button.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/views/toolbar/back_button.h"
 
 #include "ui/gfx/geometry/insets.h"
+#include "ui/views/animation/ink_drop_animation_controller.h"
 #include "ui/views/controls/button/label_button_border.h"
 #include "ui/views/painter.h"
 
@@ -31,6 +32,11 @@ void BackButton::SetLeadingMargin(int margin) {
   InvalidateLayout();
 }
 
+void BackButton::LayoutInkDrop() {
+  ink_drop_animation_controller()->SetInkDropBounds(
+      gfx::Rect(margin_leading_, 0, width() - margin_leading_, height()));
+}
+
 const char* BackButton::GetClassName() const {
   return "BackButton";
 }