[Multipaste] Calculate the anchor rect on the secondary display

The current code assumes that the Multipaste menu shows on the primary
display. This CL implements the logic to calculate the menu anchor
bounds on the secondary display.

Bug: 1117311
Change-Id: Ia42fef183d6bdb16c4a7b3f2b78ac98420de082c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2396599Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806222}

ash/clipboard/clipboard_history_controller.cc

@@ -47,6 +47,16 @@ ui::ClipboardNonBacked* GetClipboard() {
   return clipboard;
 }
 
+bool IsRectContainedByAnyDisplay(const gfx::Rect& rect) {
+  const std::vector<display::Display>& displays =
+      display::Screen::GetScreen()->GetAllDisplays();
+  for (const auto& display : displays) {
+    if (display.bounds().Contains(rect))
+      return true;
+  }
+  return false;
+}
+
 }  // namespace
 
 // ClipboardHistoryController::AcceleratorTarget -------------------------------
@@ -310,7 +320,7 @@ gfx::Rect ClipboardHistoryController::CalculateAnchorRect() const {
   ui::TextInputClient* text_input_client =
       host->GetInputMethod()->GetTextInputClient();
 
-  // |text_input_client| may be null. For example, in clamshell mode and without
+  // `text_input_client` may be null. For example, in clamshell mode and without
   // any window open.
   const gfx::Rect textfield_bounds =
       text_input_client ? text_input_client->GetCaretBounds() : gfx::Rect();
@@ -318,12 +328,11 @@ gfx::Rect ClipboardHistoryController::CalculateAnchorRect() const {
   // Note that the width of caret's bounds may be zero in some views (such as
   // the search bar of Google search web page). So we cannot use
   // gfx::Size::IsEmpty() here. In addition, the applications using IFrame may
-  // provide unreliable |textfield_bounds| which are not fully contained by the
+  // provide unreliable `textfield_bounds` which are not fully contained by the
   // display bounds.
-  // TODO(https://crbug.com/1110027).
   const bool textfield_bounds_are_valid =
       textfield_bounds.size() != gfx::Size() &&
-      display.bounds().Contains(textfield_bounds);
+      IsRectContainedByAnyDisplay(textfield_bounds);
 
   if (textfield_bounds_are_valid)
     return textfield_bounds;