Add virtual keyboard offset to tray bubble sliders for volume/brightness

If you adjust the volume while the virtual keyboard is loaded, the
slider will be hidden underneath the keyboard.

Bug: 836155
Change-Id: Ia4f4c116906f80058772decc8420c8021f463aa6
Reviewed-on: https://chromium-review.googlesource.com/1096585Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Blake O'Hare <blakeo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567923}

ash/shelf/shelf_layout_manager.h

@@ -202,6 +202,8 @@ class ASH_EXPORT ShelfLayoutManager
   // panel height. The Docked Magnifier appears above the ChromeVox panel.
   void SetDockedMagnifierHeight(int height);
 
+  gfx::Rect keyboard_bounds() const { return keyboard_bounds_; }
+
  private:
   class UpdateShelfObserver;
   friend class PanelLayoutManagerTest;

ash/system/tray/tray_background_view.cc

@@ -14,6 +14,7 @@
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_constants.h"
+#include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
@@ -475,8 +476,14 @@ gfx::Insets TrayBackgroundView::GetBubbleAnchorInsets() const {
   gfx::Insets anchor_insets = GetBubbleAnchor()->GetInsets();
   gfx::Insets tray_bg_insets = GetInsets();
   if (GetAnchorAlignment() == TrayBubbleView::ANCHOR_ALIGNMENT_BOTTOM) {
-    return gfx::Insets(-tray_bg_insets.top(), anchor_insets.left(),
-                       -tray_bg_insets.bottom(), anchor_insets.right());
+    // TODO(blakeo): There are minor variances in padding depending on if the
+    // keyboard is in anchored accessibility mode or in regular mode.
+    const gfx::Rect keyboard_occluding_bounds =
+        shelf_->shelf_layout_manager()->keyboard_bounds();
+    int keyboard_offset = keyboard_occluding_bounds.height();
+    return gfx::Insets(-tray_bg_insets.top() - keyboard_offset,
+                       anchor_insets.left(), -tray_bg_insets.bottom(),
+                       anchor_insets.right());
   } else {
     return gfx::Insets(anchor_insets.top(), -tray_bg_insets.left(),
                        anchor_insets.bottom(), -tray_bg_insets.right());