Move platform abstraction to base library

src/base/platform/condition-variable.cc

 // Copyright 2013 the V8 project 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 "src/platform/condition-variable.h"
+#include "src/base/platform/condition-variable.h"
 
 #include <errno.h>
 #include <time.h>
 
-#include "src/platform/time.h"
+#include "src/base/platform/time.h"
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 #if V8_OS_POSIX
 
 ConditionVariable::ConditionVariable() {
   // TODO(bmeurer): The test for V8_LIBRT_NOT_AVAILABLE is a temporary
   // hack to support cross-compiling Chrome for Android in AOSP. Remove
   // this once AOSP is fixed.
 #if (V8_OS_FREEBSD || V8_OS_NETBSD || V8_OS_OPENBSD || \
      (V8_OS_LINUX && V8_LIBC_GLIBC)) && !V8_LIBRT_NOT_AVAILABLE
   // On Free/Net/OpenBSD and Linux with glibc we can change the time
@@ skipping 288 matching lines @@
 
   // Release the wait event.
   ASSERT(!result || event->notified_);
   native_handle_.Post(event, result);
 
   return result;
 }
 
 #endif  // V8_OS_POSIX
 
-} }  // namespace v8::internal
+} }  // namespace v8::base