Allow javascript change the virtual keyboard window size and position freely in FLOATING mode

ui/keyboard/keyboard_controller.cc

Index: ui/keyboard/keyboard_controller.cc
diff --git a/ui/keyboard/keyboard_controller.cc b/ui/keyboard/keyboard_controller.cc
index 40065d27845179576ccee19a2564195da15f69a0..9e75ab30c6b3a8cc84a53ccb853804b13a74a5ae 100644
--- a/ui/keyboard/keyboard_controller.cc
+++ b/ui/keyboard/keyboard_controller.cc
@@ -441,15 +441,14 @@ void KeyboardController::OnShowImeIfNeeded() {
 }
 
 bool KeyboardController::ShouldEnableInsets(aura::Window* window) {
-  aura::Window *keyboard_window = proxy_->GetKeyboardWindow();
+  aura::Window* keyboard_window = proxy_->GetKeyboardWindow();
   return (keyboard_window->GetRootWindow() == window->GetRootWindow() &&
           keyboard::IsKeyboardOverscrollEnabled() &&
-          proxy_->GetKeyboardWindow()->IsVisible() &&
-          keyboard_visible_);
+          keyboard_window->IsVisible() && keyboard_visible_);
 }
 
 void KeyboardController::UpdateWindowInsets(aura::Window* window) {
-  aura::Window *keyboard_window = proxy_->GetKeyboardWindow();
+  aura::Window* keyboard_window = proxy_->GetKeyboardWindow();
   if (window == keyboard_window)
     return;
 
@@ -459,8 +458,8 @@ void KeyboardController::UpdateWindowInsets(aura::Window* window) {
     content::RenderWidgetHostView* view = widget->GetView();
     if (view && window->Contains(view->GetNativeView())) {
       gfx::Rect window_bounds = view->GetNativeView()->GetBoundsInScreen();
-      gfx::Rect intersect = gfx::IntersectRects(window_bounds,
-          proxy_->GetKeyboardWindow()->bounds());
+      gfx::Rect intersect =
+          gfx::IntersectRects(window_bounds, keyboard_window->bounds());
       int overlap = ShouldEnableInsets(window) ? intersect.height() : 0;
       if (overlap > 0 && overlap < window_bounds.height())
         view->SetInsets(gfx::Insets(0, 0, overlap, 0));
@@ -471,6 +470,26 @@ void KeyboardController::UpdateWindowInsets(aura::Window* window) {
   }
 }
 
+void KeyboardController::OnRootWindowResized(const gfx::Rect& bounds) {
+  // Keep the same height when window resize. It gets called when screen rotate.
+  if (!keyboard_container_initialized() || !proxy_->GetKeyboardWindow())
+    return;
+
+  int container_height = container_->bounds().height();
+  if (keyboard_mode_ == FULL_WIDTH) {
+    container_->SetBounds(gfx::Rect(bounds.x(),
+                                    bounds.bottom() - container_height,
+                                    bounds.width(), container_height));
+  } else if (keyboard_mode_ == FLOATING) {
+    // When screen rotate, horizontally center floating virtual keyboard window
+    // and vertically align it to the bottom.
+    int container_width = container_->bounds().width();
+    container_->SetBounds(gfx::Rect(
+        bounds.x() + (bounds.width() - container_width) / 2,
+        bounds.bottom() - container_height, container_width, container_height));
+  }
+}
+
 void KeyboardController::ShowKeyboardInternal() {
   if (!container_.get())
     return;
@@ -564,7 +583,7 @@ bool KeyboardController::WillHideKeyboard() const {
 void KeyboardController::ShowAnimationFinished() {
   // Notify observers after animation finished to prevent reveal desktop
   // background during animation.
-  NotifyKeyboardBoundsChanging(proxy_->GetKeyboardWindow()->bounds());
+  NotifyKeyboardBoundsChanging(container_->bounds());
   proxy_->EnsureCaretInWorkArea();
 }