[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

components/autofill/content/browser/content_autofill_driver_unittest.cc

 // 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.
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 143 matching lines @@
     const IPC::Message* message =
         process()->sink().GetFirstMessageMatching(messageID);
     if (!message)
       return false;
     base::Tuple<base::string16> autofill_param;
     switch (messageID) {
       case AutofillMsg_FillFieldWithValue::ID:
         if (!AutofillMsg_FillFieldWithValue::Read(message, &autofill_param))
           return false;
         break;
-      case AutofillMsg_PreviewFieldWithValue::ID:
-        if (!AutofillMsg_PreviewFieldWithValue::Read(message, &autofill_param))
+      case AutofillMsg_PreviewFieldWithValue::ID: {
+        base::Tuple<base::string16, int> autofill_param_preview;
+        if (AutofillMsg_PreviewFieldWithValue::Read(message,
+                                                    &autofill_param_preview)) {
+          if (value)
+            *value = base::get<0>(autofill_param);
+          process()->sink().ClearMessages();
+          return true;
+        }
           return false;
-        break;
+      } break;
       case AutofillMsg_AcceptDataListSuggestion::ID:
         if (!AutofillMsg_AcceptDataListSuggestion::Read(message,
                                                         &autofill_param))
           return false;
         break;
       default:
         NOTREACHED();
     }
     if (value)
       *value = base::get<0>(autofill_param);
@@ skipping 128 matching lines @@
 
   driver_->RendererShouldFillFieldWithValue(input_value);
   EXPECT_TRUE(GetString16FromMessageWithID(AutofillMsg_FillFieldWithValue::ID,
                                            &output_value));
   EXPECT_EQ(input_value, output_value);
 }
 
 TEST_F(ContentAutofillDriverTest, PreviewFieldWithValue) {
   base::string16 input_value(base::ASCIIToUTF16("barqux"));
   base::string16 output_value;
-  driver_->RendererShouldPreviewFieldWithValue(input_value);
+  size_t match_start = 0;
+  driver_->RendererShouldPreviewFieldWithValue(input_value, match_start);
   EXPECT_TRUE(GetString16FromMessageWithID(
       AutofillMsg_PreviewFieldWithValue::ID,
       &output_value));
   EXPECT_EQ(input_value, output_value);
 }
 
 }  // namespace autofill