Log the size of each of the stores and complete DB on launch and after each

components/safe_browsing_db/v4_store_unittest.cc

Index: components/safe_browsing_db/v4_store_unittest.cc
diff --git a/components/safe_browsing_db/v4_store_unittest.cc b/components/safe_browsing_db/v4_store_unittest.cc
index c0138b7b379aa1da9a6ea74a7739ae9f05bea6b1..6b727c17121a088dd8559bd822f457dc59325a3f 100644
--- a/components/safe_browsing_db/v4_store_unittest.cc
+++ b/components/safe_browsing_db/v4_store_unittest.cc
@@ -135,6 +135,7 @@ TEST_F(V4StoreTest, TestReadFromNoHashPrefixesFile) {
   V4Store store(task_runner_, store_path_);
   EXPECT_EQ(READ_SUCCESS, store.ReadFromDisk());
   EXPECT_TRUE(store.hash_prefix_map_.empty());
+  EXPECT_EQ(14ul, store.file_size_);
 }
 
 TEST_F(V4StoreTest, TestAddUnlumpedHashesWithInvalidAddition) {
@@ -562,6 +563,7 @@ TEST_F(V4StoreTest, TestReadFullResponseWithValidHashPrefixMap) {
   ASSERT_EQ(2u, read_store.hash_prefix_map_.size());
   EXPECT_EQ("00000abc", read_store.hash_prefix_map_[4]);
   EXPECT_EQ("00000abcde", read_store.hash_prefix_map_[5]);
+  EXPECT_EQ(71ul, read_store.file_size_);
 }
 
 // This tests fails to read the prefix map from the disk because the file on
@@ -783,6 +785,7 @@ TEST_F(V4StoreTest, TestChecksumErrorOnStartup) {
   EXPECT_TRUE(store.expected_checksum_.empty());
   EXPECT_EQ(READ_SUCCESS, store.ReadFromDisk());
   EXPECT_TRUE(!store.expected_checksum_.empty());
+  EXPECT_EQ(69ul, store.file_size_);
   EXPECT_EQ("test_client_state", store.state());
 
   EXPECT_FALSE(store.VerifyChecksum());
@@ -811,6 +814,7 @@ TEST_F(V4StoreTest, TestChecksumErrorOnStartup) {
   EXPECT_EQ(READ_SUCCESS, another_store.ReadFromDisk());
   EXPECT_TRUE(!another_store.expected_checksum_.empty());
   EXPECT_EQ("test_client_state", another_store.state());
+  EXPECT_EQ(69ul, store.file_size_);
 
   EXPECT_TRUE(another_store.VerifyChecksum());
 }