First stab at touch optimized omnibox auto-complete per sgabriel's mocks.

ui/gfx/native_theme_aura.cc

 // Copyright (c) 2012 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 "ui/gfx/native_theme_aura.h"
 
 #include "base/logging.h"
 #include "grit/gfx_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/rect.h"
@@ skipping 27 matching lines @@
 const SkColor kLabelBackgroundColor = SK_ColorWHITE;
 // Textfield:
 const SkColor kTextfieldDefaultColor = SK_ColorBLACK;
 const SkColor kTextfieldDefaultBackground = SK_ColorWHITE;
 const SkColor kTextfieldSelectionBackgroundFocused =
     SkColorSetARGB(0x54, 0x4D, 0x90, 0xFE);
 const SkColor kTextfieldSelectionBackgroundUnfocused = SK_ColorLTGRAY;
 const SkColor kTextfieldSelectionColor =
     color_utils::AlphaBlend(SK_ColorBLACK,
         kTextfieldSelectionBackgroundFocused, 0xdd);
+// Colors for 3D controls:
+const SkColor kThreeDLightShadow = SkColorSetRGB(0xE3, 0xE3, 0xE3);
+const SkColor kThreeDShadow = SkColorSetRGB(0xA0, 0xA0, 0xA0);
 
 }  // namespace
 
 namespace gfx {
 
 // static
 const NativeTheme* NativeTheme::instance() {
   return NativeThemeAura::instance();
 }
 
@@ skipping 58 matching lines @@
       return kTextfieldDefaultColor;
     case kColorId_TextfieldDefaultBackground:
       return kTextfieldDefaultBackground;
     case kColorId_TextfieldSelectionColor:
       return kTextfieldSelectionColor;
     case kColorId_TextfieldSelectionBackgroundFocused:
       return kTextfieldSelectionBackgroundFocused;
     case kColorId_TextfieldSelectionBackgroundUnfocused:
       return kTextfieldSelectionBackgroundUnfocused;
 
+    // Colors for 3D controls
+    case kColorId_ThreeDLightShadow:
+      return kThreeDLightShadow;
+    case kColorId_ThreeDShadow:
+      return kThreeDShadow;
+
     default:
       NOTREACHED() << "Invalid color_id: " << color_id;
       break;
   }
 
   return kInvalidColorIdColor;
 }
 
 void NativeThemeAura::PaintMenuPopupBackground(SkCanvas* canvas,
                                                const gfx::Size& size) const {
@@ skipping 147 matching lines @@
       DrawTiledImage(canvas, *center,
                      0, 0, 1.0, 1.0,
                      rect.x() + left->width(), rect.y(),
                      rect.width() - left->width() - right->width(),
                      center->height());
     }
   }
 }
 
 }  // namespace gfx