Support dragging texts into Android WebView.

ui/base/ui_base.gyp

 # Copyright 2014 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 582 matching lines @@
             '../events/devices/events_devices.gyp:events_devices',
             '../events/platform/x11/x11_events_platform.gyp:x11_events_platform',
             '../gfx/x/gfx_x11.gyp:gfx_x11',
           ],
         }],
         ['use_x11==1 and chromeos==0', {
           'dependencies': [
             '../../build/linux/system.gyp:xscrnsaver',
           ],
         }],
-        ['toolkit_views==0', {
+        ['toolkit_views==0 and OS!="android"', {
           'sources!': [
             'dragdrop/drag_drop_types.h',
             'dragdrop/drop_target_event.cc',
             'dragdrop/drop_target_event.h',
             'dragdrop/os_exchange_data.cc',
             'dragdrop/os_exchange_data.h',
             'nine_image_painter_factory.cc',
             'nine_image_painter_factory.h',
           ],
         }],
@@ skipping 16 matching lines @@
             '../android/ui_android.gyp:ui_java',
             'ui_base_jni_headers',
           ],
           'link_settings': {
             'libraries': [
               '-ljnigraphics',
             ],
           },
         }],
         ['OS=="android" and use_aura==0', {
+          'sources+': [
+            'dragdrop/drag_drop_types.h',
+            'dragdrop/drop_target_event.cc',
+            'dragdrop/drop_target_event.h',
+            'dragdrop/os_exchange_data.cc',
+            'dragdrop/os_exchange_data.h',
+            'dragdrop/os_exchange_data_provider_android.cc',
+            'dragdrop/os_exchange_data_provider_android.h',
+          ],
           'sources!': [
             'cursor/cursor_android.cc',
             'idle/idle.cc',
             'idle/idle.h',
             'idle/idle_android.cc',
           ],
         }],
         ['OS=="android" and use_aura==1', {
           'sources!': [
             'clipboard/clipboard_aura.cc'
@@ skipping 110 matching lines @@
            ],
            'variables': {
              'jni_gen_package': 'ui',
            },
            'includes': [ '../../build/jni_generator.gypi' ],
          },
        ],
     }],
   ],
 }