views textfield: Handle ctrl and shift modifiers for Backspace and Delete

views/controls/textfield/native_textfield_views.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "views/controls/textfield/native_textfield_views.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 446 matching lines @@
         break;
       case app::VKEY_END:
         model_->MoveCursorToEnd(selection);
         cursor_changed = true;
         break;
       case app::VKEY_HOME:
         model_->MoveCursorToStart(selection);
         cursor_changed = true;
         break;
       case app::VKEY_BACK:
+        if (!model_->HasSelection()) {
+          if (selection && control) {
+            // If both shift and control are pressed, then erase upto the
+            // beginning of the buffer in ChromeOS. In windows, do nothing.
+#if defined(OS_WIN)
+            break;
+#else
+            model_->MoveCursorToStart(true);
+#endif
+          } else if (control) {
+            // If only control is pressed, then erase the previous word.
+            model_->MoveCursorToPreviousWord(true);
+          }
+        }
         text_changed = model_->Backspace();
         cursor_changed = true;
         break;
       case app::VKEY_DELETE:
+        if (!model_->HasSelection()) {
+          if (selection && control) {
+            // If both shift and control are pressed, then erase upto the
+            // end of the buffer in ChromeOS. In windows, do nothing.
+#if defined(OS_WIN)
+            break;
+#else
+            model_->MoveCursorToEnd(true);
+#endif
+          } else if (control) {
+            // If only control is pressed, then erase the next word.
+            model_->MoveCursorToNextWord(true);
+          }
+        }
         text_changed = model_->Delete();
         break;
       case app::VKEY_INSERT:
         insert_ = !insert_;
         cursor_changed = true;
         break;
       default:
         break;
     }
     char16 print_char = GetPrintableChar(key_event);
@@ skipping 233 matching lines @@
 }
 
 void NativeTextfieldViews::TextfieldBorder::SetInsets(int top,
                                                       int left,
                                                       int bottom,
                                                       int right) {
   insets_.Set(top, left, bottom, right);
 }
 
 }  // namespace views