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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "net/disk_cache/in_flight_backend_io.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/bind_helpers.h" | |
| 9 #include "base/compiler_specific.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "net/base/net_errors.h" | |
| 12 #include "net/disk_cache/backend_impl.h" | |
| 13 #include "net/disk_cache/entry_impl.h" | |
| 14 #include "net/disk_cache/histogram_macros.h" | |
| 15 | |
| 16 namespace disk_cache { | |
| 17 | |
| 18 BackendIO::BackendIO(InFlightIO* controller, BackendImpl* backend, | |
| 19 const net::CompletionCallback& callback) | |
| 20 : BackgroundIO(controller), | |
| 21 backend_(backend), | |
| 22 callback_(callback), | |
| 23 operation_(OP_NONE), | |
| 24 entry_ptr_(NULL), | |
| 25 iter_ptr_(NULL), | |
| 26 iter_(NULL), | |
| 27 entry_(NULL), | |
| 28 index_(0), | |
| 29 offset_(0), | |
| 30 buf_len_(0), | |
| 31 truncate_(false), | |
| 32 offset64_(0), | |
| 33 start_(NULL) { | |
| 34 start_time_ = base::TimeTicks::Now(); | |
| 35 } | |
| 36 | |
| 37 // Runs on the background thread. | |
| 38 void BackendIO::ExecuteOperation() { | |
| 39 if (IsEntryOperation()) | |
| 40 return ExecuteEntryOperation(); | |
| 41 | |
| 42 ExecuteBackendOperation(); | |
| 43 } | |
| 44 | |
| 45 // Runs on the background thread. | |
| 46 void BackendIO::OnIOComplete(int result) { | |
| 47 DCHECK(IsEntryOperation()); | |
| 48 DCHECK_NE(result, net::ERR_IO_PENDING); | |
| 49 result_ = result; | |
| 50 NotifyController(); | |
| 51 } | |
| 52 | |
| 53 // Runs on the primary thread. | |
| 54 void BackendIO::OnDone(bool cancel) { | |
| 55 if (IsEntryOperation()) { | |
| 56 CACHE_UMA(TIMES, "TotalIOTime", 0, ElapsedTime()); | |
| 57 } | |
| 58 | |
| 59 if (!ReturnsEntry()) | |
| 60 return; | |
| 61 | |
| 62 if (result() == net::OK) { | |
| 63 static_cast<EntryImpl*>(*entry_ptr_)->OnEntryCreated(backend_); | |
| 64 if (cancel) | |
| 65 (*entry_ptr_)->Close(); | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 bool BackendIO::IsEntryOperation() { | |
| 70 return operation_ > OP_MAX_BACKEND; | |
| 71 } | |
| 72 | |
| 73 // Runs on the background thread. | |
| 74 void BackendIO::ReferenceEntry() { | |
| 75 entry_->AddRef(); | |
| 76 } | |
| 77 | |
| 78 void BackendIO::Init() { | |
| 79 operation_ = OP_INIT; | |
| 80 } | |
| 81 | |
| 82 void BackendIO::OpenEntry(const std::string& key, Entry** entry) { | |
| 83 operation_ = OP_OPEN; | |
| 84 key_ = key; | |
| 85 entry_ptr_ = entry; | |
| 86 } | |
| 87 | |
| 88 void BackendIO::CreateEntry(const std::string& key, Entry** entry) { | |
| 89 operation_ = OP_CREATE; | |
| 90 key_ = key; | |
| 91 entry_ptr_ = entry; | |
| 92 } | |
| 93 | |
| 94 void BackendIO::DoomEntry(const std::string& key) { | |
| 95 operation_ = OP_DOOM; | |
| 96 key_ = key; | |
| 97 } | |
| 98 | |
| 99 void BackendIO::DoomAllEntries() { | |
| 100 operation_ = OP_DOOM_ALL; | |
| 101 } | |
| 102 | |
| 103 void BackendIO::DoomEntriesBetween(const base::Time initial_time, | |
| 104 const base::Time end_time) { | |
| 105 operation_ = OP_DOOM_BETWEEN; | |
| 106 initial_time_ = initial_time; | |
| 107 end_time_ = end_time; | |
| 108 } | |
| 109 | |
| 110 void BackendIO::DoomEntriesSince(const base::Time initial_time) { | |
| 111 operation_ = OP_DOOM_SINCE; | |
| 112 initial_time_ = initial_time; | |
| 113 } | |
| 114 | |
| 115 void BackendIO::OpenNextEntry(void** iter, Entry** next_entry) { | |
| 116 operation_ = OP_OPEN_NEXT; | |
| 117 iter_ptr_ = iter; | |
| 118 entry_ptr_ = next_entry; | |
| 119 } | |
| 120 | |
| 121 void BackendIO::OpenPrevEntry(void** iter, Entry** prev_entry) { | |
| 122 operation_ = OP_OPEN_PREV; | |
| 123 iter_ptr_ = iter; | |
| 124 entry_ptr_ = prev_entry; | |
| 125 } | |
| 126 | |
| 127 void BackendIO::EndEnumeration(void* iterator) { | |
| 128 operation_ = OP_END_ENUMERATION; | |
| 129 iter_ = iterator; | |
| 130 } | |
| 131 | |
| 132 void BackendIO::OnExternalCacheHit(const std::string& key) { | |
| 133 operation_ = OP_ON_EXTERNAL_CACHE_HIT; | |
| 134 key_ = key; | |
| 135 } | |
| 136 | |
| 137 void BackendIO::CloseEntryImpl(EntryImpl* entry) { | |
| 138 operation_ = OP_CLOSE_ENTRY; | |
| 139 entry_ = entry; | |
| 140 } | |
| 141 | |
| 142 void BackendIO::DoomEntryImpl(EntryImpl* entry) { | |
| 143 operation_ = OP_DOOM_ENTRY; | |
| 144 entry_ = entry; | |
| 145 } | |
| 146 | |
| 147 void BackendIO::FlushQueue() { | |
| 148 operation_ = OP_FLUSH_QUEUE; | |
| 149 } | |
| 150 | |
| 151 void BackendIO::RunTask(const base::Closure& task) { | |
| 152 operation_ = OP_RUN_TASK; | |
| 153 task_ = task; | |
| 154 } | |
| 155 | |
| 156 void BackendIO::ReadData(EntryImpl* entry, int index, int offset, | |
| 157 net::IOBuffer* buf, int buf_len) { | |
| 158 operation_ = OP_READ; | |
| 159 entry_ = entry; | |
| 160 index_ = index; | |
| 161 offset_ = offset; | |
| 162 buf_ = buf; | |
| 163 buf_len_ = buf_len; | |
| 164 } | |
| 165 | |
| 166 void BackendIO::WriteData(EntryImpl* entry, int index, int offset, | |
| 167 net::IOBuffer* buf, int buf_len, bool truncate) { | |
| 168 operation_ = OP_WRITE; | |
| 169 entry_ = entry; | |
| 170 index_ = index; | |
| 171 offset_ = offset; | |
| 172 buf_ = buf; | |
| 173 buf_len_ = buf_len; | |
| 174 truncate_ = truncate; | |
| 175 } | |
| 176 | |
| 177 void BackendIO::ReadSparseData(EntryImpl* entry, int64 offset, | |
| 178 net::IOBuffer* buf, int buf_len) { | |
| 179 operation_ = OP_READ_SPARSE; | |
| 180 entry_ = entry; | |
| 181 offset64_ = offset; | |
| 182 buf_ = buf; | |
| 183 buf_len_ = buf_len; | |
| 184 } | |
| 185 | |
| 186 void BackendIO::WriteSparseData(EntryImpl* entry, int64 offset, | |
| 187 net::IOBuffer* buf, int buf_len) { | |
| 188 operation_ = OP_WRITE_SPARSE; | |
| 189 entry_ = entry; | |
| 190 offset64_ = offset; | |
| 191 buf_ = buf; | |
| 192 buf_len_ = buf_len; | |
| 193 } | |
| 194 | |
| 195 void BackendIO::GetAvailableRange(EntryImpl* entry, int64 offset, int len, | |
| 196 int64* start) { | |
| 197 operation_ = OP_GET_RANGE; | |
| 198 entry_ = entry; | |
| 199 offset64_ = offset; | |
| 200 buf_len_ = len; | |
| 201 start_ = start; | |
| 202 } | |
| 203 | |
| 204 void BackendIO::CancelSparseIO(EntryImpl* entry) { | |
| 205 operation_ = OP_CANCEL_IO; | |
| 206 entry_ = entry; | |
| 207 } | |
| 208 | |
| 209 void BackendIO::ReadyForSparseIO(EntryImpl* entry) { | |
| 210 operation_ = OP_IS_READY; | |
| 211 entry_ = entry; | |
| 212 } | |
| 213 | |
| 214 BackendIO::~BackendIO() {} | |
| 215 | |
| 216 bool BackendIO::ReturnsEntry() { | |
| 217 return (operation_ == OP_OPEN || operation_ == OP_CREATE || | |
| 218 operation_ == OP_OPEN_NEXT || operation_ == OP_OPEN_PREV); | |
| 219 } | |
| 220 | |
| 221 base::TimeDelta BackendIO::ElapsedTime() const { | |
| 222 return base::TimeTicks::Now() - start_time_; | |
| 223 } | |
| 224 | |
| 225 // Runs on the background thread. | |
| 226 void BackendIO::ExecuteBackendOperation() { | |
| 227 switch (operation_) { | |
| 228 case OP_INIT: | |
| 229 result_ = backend_->SyncInit(); | |
| 230 break; | |
| 231 case OP_OPEN: | |
| 232 result_ = backend_->SyncOpenEntry(key_, entry_ptr_); | |
| 233 break; | |
| 234 case OP_CREATE: | |
| 235 result_ = backend_->SyncCreateEntry(key_, entry_ptr_); | |
| 236 break; | |
| 237 case OP_DOOM: | |
| 238 result_ = backend_->SyncDoomEntry(key_); | |
| 239 break; | |
| 240 case OP_DOOM_ALL: | |
| 241 result_ = backend_->SyncDoomAllEntries(); | |
| 242 break; | |
| 243 case OP_DOOM_BETWEEN: | |
| 244 result_ = backend_->SyncDoomEntriesBetween(initial_time_, end_time_); | |
| 245 break; | |
| 246 case OP_DOOM_SINCE: | |
| 247 result_ = backend_->SyncDoomEntriesSince(initial_time_); | |
| 248 break; | |
| 249 case OP_OPEN_NEXT: | |
| 250 result_ = backend_->SyncOpenNextEntry(iter_ptr_, entry_ptr_); | |
| 251 break; | |
| 252 case OP_OPEN_PREV: | |
| 253 result_ = backend_->SyncOpenPrevEntry(iter_ptr_, entry_ptr_); | |
| 254 break; | |
| 255 case OP_END_ENUMERATION: | |
| 256 backend_->SyncEndEnumeration(iter_); | |
| 257 result_ = net::OK; | |
| 258 break; | |
| 259 case OP_ON_EXTERNAL_CACHE_HIT: | |
| 260 backend_->SyncOnExternalCacheHit(key_); | |
| 261 result_ = net::OK; | |
| 262 break; | |
| 263 case OP_CLOSE_ENTRY: | |
| 264 entry_->Release(); | |
| 265 result_ = net::OK; | |
| 266 break; | |
| 267 case OP_DOOM_ENTRY: | |
| 268 entry_->DoomImpl(); | |
| 269 result_ = net::OK; | |
| 270 break; | |
| 271 case OP_FLUSH_QUEUE: | |
| 272 result_ = net::OK; | |
| 273 break; | |
| 274 case OP_RUN_TASK: | |
| 275 task_.Run(); | |
| 276 result_ = net::OK; | |
| 277 break; | |
| 278 default: | |
| 279 NOTREACHED() << "Invalid Operation"; | |
| 280 result_ = net::ERR_UNEXPECTED; | |
| 281 } | |
| 282 DCHECK_NE(net::ERR_IO_PENDING, result_); | |
| 283 NotifyController(); | |
| 284 } | |
| 285 | |
| 286 // Runs on the background thread. | |
| 287 void BackendIO::ExecuteEntryOperation() { | |
| 288 switch (operation_) { | |
| 289 case OP_READ: | |
| 290 result_ = | |
| 291 entry_->ReadDataImpl(index_, offset_, buf_.get(), buf_len_, | |
| 292 base::Bind(&BackendIO::OnIOComplete, this)); | |
| 293 break; | |
| 294 case OP_WRITE: | |
| 295 result_ = | |
| 296 entry_->WriteDataImpl(index_, offset_, buf_.get(), buf_len_, | |
| 297 base::Bind(&BackendIO::OnIOComplete, this), | |
| 298 truncate_); | |
| 299 break; | |
| 300 case OP_READ_SPARSE: | |
| 301 result_ = entry_->ReadSparseDataImpl( | |
| 302 offset64_, buf_.get(), buf_len_, | |
| 303 base::Bind(&BackendIO::OnIOComplete, this)); | |
| 304 break; | |
| 305 case OP_WRITE_SPARSE: | |
| 306 result_ = entry_->WriteSparseDataImpl( | |
| 307 offset64_, buf_.get(), buf_len_, | |
| 308 base::Bind(&BackendIO::OnIOComplete, this)); | |
| 309 break; | |
| 310 case OP_GET_RANGE: | |
| 311 result_ = entry_->GetAvailableRangeImpl(offset64_, buf_len_, start_); | |
| 312 break; | |
| 313 case OP_CANCEL_IO: | |
| 314 entry_->CancelSparseIOImpl(); | |
| 315 result_ = net::OK; | |
| 316 break; | |
| 317 case OP_IS_READY: | |
| 318 result_ = entry_->ReadyForSparseIOImpl( | |
| 319 base::Bind(&BackendIO::OnIOComplete, this)); | |
| 320 break; | |
| 321 default: | |
| 322 NOTREACHED() << "Invalid Operation"; | |
| 323 result_ = net::ERR_UNEXPECTED; | |
| 324 } | |
| 325 buf_ = NULL; | |
| 326 if (result_ != net::ERR_IO_PENDING) | |
| 327 NotifyController(); | |
| 328 } | |
| 329 | |
| 330 InFlightBackendIO::InFlightBackendIO(BackendImpl* backend, | |
| 331 base::MessageLoopProxy* background_thread) | |
| 332 : backend_(backend), | |
| 333 background_thread_(background_thread), | |
| 334 ptr_factory_(this) { | |
| 335 } | |
| 336 | |
| 337 InFlightBackendIO::~InFlightBackendIO() { | |
| 338 } | |
| 339 | |
| 340 void InFlightBackendIO::Init(const net::CompletionCallback& callback) { | |
| 341 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 342 operation->Init(); | |
| 343 PostOperation(operation.get()); | |
| 344 } | |
| 345 | |
| 346 void InFlightBackendIO::OpenEntry(const std::string& key, Entry** entry, | |
| 347 const net::CompletionCallback& callback) { | |
| 348 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 349 operation->OpenEntry(key, entry); | |
| 350 PostOperation(operation.get()); | |
| 351 } | |
| 352 | |
| 353 void InFlightBackendIO::CreateEntry(const std::string& key, Entry** entry, | |
| 354 const net::CompletionCallback& callback) { | |
| 355 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 356 operation->CreateEntry(key, entry); | |
| 357 PostOperation(operation.get()); | |
| 358 } | |
| 359 | |
| 360 void InFlightBackendIO::DoomEntry(const std::string& key, | |
| 361 const net::CompletionCallback& callback) { | |
| 362 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 363 operation->DoomEntry(key); | |
| 364 PostOperation(operation.get()); | |
| 365 } | |
| 366 | |
| 367 void InFlightBackendIO::DoomAllEntries( | |
| 368 const net::CompletionCallback& callback) { | |
| 369 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 370 operation->DoomAllEntries(); | |
| 371 PostOperation(operation.get()); | |
| 372 } | |
| 373 | |
| 374 void InFlightBackendIO::DoomEntriesBetween(const base::Time initial_time, | |
| 375 const base::Time end_time, | |
| 376 const net::CompletionCallback& callback) { | |
| 377 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 378 operation->DoomEntriesBetween(initial_time, end_time); | |
| 379 PostOperation(operation.get()); | |
| 380 } | |
| 381 | |
| 382 void InFlightBackendIO::DoomEntriesSince( | |
| 383 const base::Time initial_time, const net::CompletionCallback& callback) { | |
| 384 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 385 operation->DoomEntriesSince(initial_time); | |
| 386 PostOperation(operation.get()); | |
| 387 } | |
| 388 | |
| 389 void InFlightBackendIO::OpenNextEntry(void** iter, Entry** next_entry, | |
| 390 const net::CompletionCallback& callback) { | |
| 391 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 392 operation->OpenNextEntry(iter, next_entry); | |
| 393 PostOperation(operation.get()); | |
| 394 } | |
| 395 | |
| 396 void InFlightBackendIO::OpenPrevEntry(void** iter, Entry** prev_entry, | |
| 397 const net::CompletionCallback& callback) { | |
| 398 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 399 operation->OpenPrevEntry(iter, prev_entry); | |
| 400 PostOperation(operation.get()); | |
| 401 } | |
| 402 | |
| 403 void InFlightBackendIO::EndEnumeration(void* iterator) { | |
| 404 scoped_refptr<BackendIO> operation( | |
| 405 new BackendIO(this, backend_, net::CompletionCallback())); | |
| 406 operation->EndEnumeration(iterator); | |
| 407 PostOperation(operation.get()); | |
| 408 } | |
| 409 | |
| 410 void InFlightBackendIO::OnExternalCacheHit(const std::string& key) { | |
| 411 scoped_refptr<BackendIO> operation( | |
| 412 new BackendIO(this, backend_, net::CompletionCallback())); | |
| 413 operation->OnExternalCacheHit(key); | |
| 414 PostOperation(operation.get()); | |
| 415 } | |
| 416 | |
| 417 void InFlightBackendIO::CloseEntryImpl(EntryImpl* entry) { | |
| 418 scoped_refptr<BackendIO> operation( | |
| 419 new BackendIO(this, backend_, net::CompletionCallback())); | |
| 420 operation->CloseEntryImpl(entry); | |
| 421 PostOperation(operation.get()); | |
| 422 } | |
| 423 | |
| 424 void InFlightBackendIO::DoomEntryImpl(EntryImpl* entry) { | |
| 425 scoped_refptr<BackendIO> operation( | |
| 426 new BackendIO(this, backend_, net::CompletionCallback())); | |
| 427 operation->DoomEntryImpl(entry); | |
| 428 PostOperation(operation.get()); | |
| 429 } | |
| 430 | |
| 431 void InFlightBackendIO::FlushQueue(const net::CompletionCallback& callback) { | |
| 432 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 433 operation->FlushQueue(); | |
| 434 PostOperation(operation.get()); | |
| 435 } | |
| 436 | |
| 437 void InFlightBackendIO::RunTask( | |
| 438 const base::Closure& task, const net::CompletionCallback& callback) { | |
| 439 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 440 operation->RunTask(task); | |
| 441 PostOperation(operation.get()); | |
| 442 } | |
| 443 | |
| 444 void InFlightBackendIO::ReadData(EntryImpl* entry, int index, int offset, | |
| 445 net::IOBuffer* buf, int buf_len, | |
| 446 const net::CompletionCallback& callback) { | |
| 447 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 448 operation->ReadData(entry, index, offset, buf, buf_len); | |
| 449 PostOperation(operation.get()); | |
| 450 } | |
| 451 | |
| 452 void InFlightBackendIO::WriteData(EntryImpl* entry, int index, int offset, | |
| 453 net::IOBuffer* buf, int buf_len, | |
| 454 bool truncate, | |
| 455 const net::CompletionCallback& callback) { | |
| 456 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 457 operation->WriteData(entry, index, offset, buf, buf_len, truncate); | |
| 458 PostOperation(operation.get()); | |
| 459 } | |
| 460 | |
| 461 void InFlightBackendIO::ReadSparseData( | |
| 462 EntryImpl* entry, int64 offset, net::IOBuffer* buf, int buf_len, | |
| 463 const net::CompletionCallback& callback) { | |
| 464 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 465 operation->ReadSparseData(entry, offset, buf, buf_len); | |
| 466 PostOperation(operation.get()); | |
| 467 } | |
| 468 | |
| 469 void InFlightBackendIO::WriteSparseData( | |
| 470 EntryImpl* entry, int64 offset, net::IOBuffer* buf, int buf_len, | |
| 471 const net::CompletionCallback& callback) { | |
| 472 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 473 operation->WriteSparseData(entry, offset, buf, buf_len); | |
| 474 PostOperation(operation.get()); | |
| 475 } | |
| 476 | |
| 477 void InFlightBackendIO::GetAvailableRange( | |
| 478 EntryImpl* entry, int64 offset, int len, int64* start, | |
| 479 const net::CompletionCallback& callback) { | |
| 480 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 481 operation->GetAvailableRange(entry, offset, len, start); | |
| 482 PostOperation(operation.get()); | |
| 483 } | |
| 484 | |
| 485 void InFlightBackendIO::CancelSparseIO(EntryImpl* entry) { | |
| 486 scoped_refptr<BackendIO> operation( | |
| 487 new BackendIO(this, backend_, net::CompletionCallback())); | |
| 488 operation->CancelSparseIO(entry); | |
| 489 PostOperation(operation.get()); | |
| 490 } | |
| 491 | |
| 492 void InFlightBackendIO::ReadyForSparseIO( | |
| 493 EntryImpl* entry, const net::CompletionCallback& callback) { | |
| 494 scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback)); | |
| 495 operation->ReadyForSparseIO(entry); | |
| 496 PostOperation(operation.get()); | |
| 497 } | |
| 498 | |
| 499 void InFlightBackendIO::WaitForPendingIO() { | |
| 500 InFlightIO::WaitForPendingIO(); | |
| 501 } | |
| 502 | |
| 503 void InFlightBackendIO::OnOperationComplete(BackgroundIO* operation, | |
| 504 bool cancel) { | |
| 505 BackendIO* op = static_cast<BackendIO*>(operation); | |
| 506 op->OnDone(cancel); | |
| 507 | |
| 508 if (!op->callback().is_null() && (!cancel || op->IsEntryOperation())) | |
| 509 op->callback().Run(op->result()); | |
| 510 } | |
| 511 | |
| 512 void InFlightBackendIO::PostOperation(BackendIO* operation) { | |
| 513 background_thread_->PostTask(FROM_HERE, | |
| 514 base::Bind(&BackendIO::ExecuteOperation, operation)); | |
| 515 OnOperationPosted(operation); | |
| 516 } | |
| 517 | |
| 518 base::WeakPtr<InFlightBackendIO> InFlightBackendIO::GetWeakPtr() { | |
| 519 return ptr_factory_.GetWeakPtr(); | |
| 520 } | |
| 521 | |
| 522 } // namespace | |
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Chromium Code Reviews
Issue 121643003:
Reorganize net/disk_cache into backend specific directories. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src