Revert of Move TouchSelectionController from content to ui

ui/base/touch/touch_editing_controller.cc

Index: ui/base/touch/touch_editing_controller.cc
diff --git a/ui/base/touch/touch_editing_controller.cc b/ui/base/touch/touch_editing_controller.cc
index 1b84ed929bf2af8ad365bd6974d87ec7e3866bb7..f3c4c243a90d8fdc9ec4688980efb90c6b0ae3c8 100644
--- a/ui/base/touch/touch_editing_controller.cc
+++ b/ui/base/touch/touch_editing_controller.cc
@@ -9,6 +9,45 @@
 namespace {
 TouchSelectionControllerFactory* g_shared_instance = NULL;
 }  // namespace
+
+SelectionBound::SelectionBound()
+    : type(ui::SelectionBound::EMPTY) {
+}
+
+SelectionBound::~SelectionBound() {
+}
+
+int SelectionBound::GetHeight() const {
+  return edge_bottom.y() - edge_top.y();
+}
+
+bool operator==(const SelectionBound& lhs, const SelectionBound& rhs) {
+  return lhs.type == rhs.type && lhs.edge_top == rhs.edge_top &&
+         lhs.edge_bottom == rhs.edge_bottom;
+}
+
+bool operator!=(const SelectionBound& lhs, const SelectionBound& rhs) {
+  return !(lhs == rhs);
+}
+
+gfx::Rect RectBetweenSelectionBounds(const SelectionBound& b1,
+                                     const SelectionBound& b2) {
+  int all_x[] ={
+      b1.edge_top.x(), b2.edge_top.x(), b1.edge_bottom.x(), b2.edge_bottom.x()
+  };
+  int all_y[] = {
+      b1.edge_top.y(), b2.edge_top.y(), b1.edge_bottom.y(), b2.edge_bottom.y()
+  };
+  const int num_elements = arraysize(all_x);
+  COMPILE_ASSERT(arraysize(all_y) == num_elements, array_size_mismatch);
+
+  int left = *std::min_element(all_x, all_x + num_elements);
+  int top = *std::min_element(all_y, all_y + num_elements);
+  int right = *std::max_element(all_x, all_x + num_elements);
+  int bottom = *std::max_element(all_y, all_y + num_elements);
+
+  return gfx::Rect(left, top, right - left, bottom - top);
+}
 
 TouchSelectionController* TouchSelectionController::create(
     TouchEditable* client_view) {