[Passwords] Add 32-bit checksum field to AutofillRandomizedValue for...

[Passwords] Add 32-bit checksum field to AutofillRandomizedValue for crowdsourcing change password urls.

Bug: 1095605
Change-Id: I3b7b40b7a9612e9c199697d9359e70fa857a7af3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246594
Commit-Queue: Jonathan Mengedoht <mengedoht@google.com>
Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779363}

components/autofill/core/browser/autofill_download_manager_unittest.cc

@@ -2007,6 +2007,8 @@ TEST_P(AutofillUploadTest, RichMetadata) {
     EXPECT_TRUE(upload.randomized_form_metadata().has_id());
     EXPECT_TRUE(upload.randomized_form_metadata().has_name());
     EXPECT_TRUE(upload.randomized_form_metadata().has_url());
+    ASSERT_TRUE(upload.randomized_form_metadata().has_checksum_for_url());
+    EXPECT_EQ(upload.randomized_form_metadata().checksum_for_url(), 3608731642);
     EXPECT_EQ(3, upload.field_size());
     for (const auto& f : upload.field()) {
       ASSERT_TRUE(f.has_randomized_field_metadata());

components/autofill/core/browser/form_structure.cc

@@ -470,6 +470,7 @@ void PopulateRandomizedFormMetadata(const RandomizedEncoder& encoder,
     EncodeRandomizedValue(encoder, form_signature, kNullFieldSignature,
                           RandomizedEncoder::FORM_URL, full_source_url,
                           metadata->mutable_url());
+    metadata->set_checksum_for_url(StrToHash32Bit(full_source_url));
   }
 }
 

components/autofill/core/browser/proto/server.proto

@@ -156,6 +156,9 @@ message AutofillRandomizedFormMetadata {
   }
   // Titles of form's buttons. Example: <input type="submit" value="XXXXX">
   repeated ButtonTitle button_title = 5;
+
+  // Hash of the clear form URL, not randomized.
+  optional fixed32 checksum_for_url = 6;
 }
 
 // The collection of autofill field metadata to be sent using randomization.