Prevent a11y on-screen keyboard from occluding active text field.

ash/wm/workspace/workspace_layout_manager.cc

Index: ash/wm/workspace/workspace_layout_manager.cc
diff --git a/ash/wm/workspace/workspace_layout_manager.cc b/ash/wm/workspace/workspace_layout_manager.cc
index 668f895d2eae1b1e240eaa5fc0b063c997bf4211..0326e6a6f3f8d6418773e85e229f3899059deb38 100644
--- a/ash/wm/workspace/workspace_layout_manager.cc
+++ b/ash/wm/workspace/workspace_layout_manager.cc
@@ -21,10 +21,13 @@
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/text_input_client.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/layer.h"
 #include "ui/events/event.h"
 #include "ui/gfx/screen.h"
+#include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/wm/core/window_util.h"
 #include "ui/wm/public/activation_client.h"
 
@@ -124,6 +127,32 @@ void WorkspaceLayoutManager::SetChildBounds(
 }
 
 //////////////////////////////////////////////////////////////////////////////
+// WorkspaceLayoutManager, keyboard::KeyboardControllerObserver implementation:
+
+void WorkspaceLayoutManager::OnKeyboardBoundsChanging(
+    const gfx::Rect& new_bounds) {
+  aura::Window* root_window = window_->GetRootWindow();
+  ui::InputMethod* input_method =
+      root_window->GetProperty(aura::client::kRootWindowInputMethodKey);
+  ui::TextInputClient* text_input_client = input_method->GetTextInputClient();
+  if(!text_input_client)
+    return;
+  aura::Window *window = text_input_client->GetAttachedWindow();
+  if (!window || !window_->Contains(window))
+    return;
+  gfx::Rect window_bounds = ScreenUtil::ConvertRectToScreen(
+      window_,
+      window->GetTargetBounds());
+  gfx::Rect intersect = gfx::IntersectRects(window_bounds, new_bounds);
+  int shift = std::min(intersect.height(),
+                       window->bounds().y() - work_area_in_parent_.y());
+  if (shift > 0) {
+    gfx::Point origin(window->bounds().x(), window->bounds().y() - shift);
+    SetChildBounds(window, gfx::Rect(origin, window->bounds().size()));
+  }
+}
+
+//////////////////////////////////////////////////////////////////////////////
 // WorkspaceLayoutManager, ash::ShellObserver implementation:
 
 void WorkspaceLayoutManager::OnDisplayWorkAreaInsetsChanged() {