New AppListView Scroll Behavior.

ui/app_list/views/search_box_view.cc

Index: ui/app_list/views/search_box_view.cc
diff --git a/ui/app_list/views/search_box_view.cc b/ui/app_list/views/search_box_view.cc
index 45f30f10e33ed59701d0bb5eb7fc6639b8adf15f..e3b26eba12a719c8d6b462e162b0adcedc8946ce 100644
--- a/ui/app_list/views/search_box_view.cc
+++ b/ui/app_list/views/search_box_view.cc
@@ -29,6 +29,7 @@
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/geometry/insets.h"
+#include "ui/gfx/geometry/vector2d_conversions.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/shadow_value.h"
 #include "ui/strings/grit/ui_strings.h"
@@ -276,20 +277,23 @@ bool SearchBoxView::MoveTabFocus(bool move_backwards) {
     case FOCUS_SEARCH_BOX:
       if (move_backwards) {
         focused_view_ = back_button_ && back_button_->visible()
-            ? FOCUS_BACK_BUTTON : FOCUS_SEARCH_BOX;
+                            ? FOCUS_BACK_BUTTON
+                            : FOCUS_SEARCH_BOX;
       } else {
         focused_view_ = speech_button_ && speech_button_->visible()
-            ? FOCUS_MIC_BUTTON : FOCUS_CONTENTS_VIEW;
+                            ? FOCUS_MIC_BUTTON
+                            : FOCUS_CONTENTS_VIEW;
       }
       break;
     case FOCUS_MIC_BUTTON:
       focused_view_ = move_backwards ? FOCUS_SEARCH_BOX : FOCUS_CONTENTS_VIEW;
       break;
     case FOCUS_CONTENTS_VIEW:
-      focused_view_ = move_backwards
-          ? (speech_button_ && speech_button_->visible() ?
-              FOCUS_MIC_BUTTON : FOCUS_SEARCH_BOX)
-          : FOCUS_CONTENTS_VIEW;
+      focused_view_ =
+          move_backwards
+              ? (speech_button_ && speech_button_->visible() ? FOCUS_MIC_BUTTON
+                                                             : FOCUS_SEARCH_BOX)
+              : FOCUS_CONTENTS_VIEW;
       break;
     default:
       DCHECK(false);
@@ -351,10 +355,20 @@ void SearchBoxView::ShowBackOrGoogleIcon(bool show_back_button) {
   content_container_->Layout();
 }
 
+void SearchBoxView::OnMouseEvent(ui::MouseEvent* event) {
+  if (!is_fullscreen_app_list_enabled_)
+    return;
+
+  if (event->type() != ui::ET_MOUSEWHEEL)
+    return;
+
+  if (app_list_view_->HandleScroll(event))
+    event->SetHandled();
+}
+
 bool SearchBoxView::OnMouseWheel(const ui::MouseWheelEvent& event) {
   if (contents_view_)
     return contents_view_->OnMouseWheel(event);
-
   return false;
 }
 
@@ -441,6 +455,17 @@ bool SearchBoxView::HandleKeyEvent(views::Textfield* sender,
   return false;
 }
 
+bool SearchBoxView::HandleMouseEvent(views::Textfield* sender,
+                                     const ui::MouseEvent& mouse_event) {
+  if (!is_fullscreen_app_list_enabled_)
+    return false;
+
+  if (mouse_event.type() != ui::ET_MOUSEWHEEL)
+    return false;
+
+  return app_list_view_->HandleScroll(&mouse_event);
+}
+
 void SearchBoxView::ButtonPressed(views::Button* sender,
                                   const ui::Event& event) {
   if (back_button_ && sender == back_button_)