Expand OS_LINUX to OS_LINUX || OS_CHROMEOS.

Currently OS_LINUX is defined on Chrome OS build,
but it is being unset. This is the preparation to keep the
current behavior.

Bug: 1110266
Test: Built locally.
Change-Id: I773b4d46bc2e1f1cba9e3b8d0de5503d4e40eb92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449610
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813779}

base/allocator/partition_allocator/partition_lock.h

@@ -14,7 +14,7 @@
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
 #include "base/allocator/partition_allocator/spinning_futex_linux.h"
 #endif
 
@@ -142,7 +142,7 @@ class LOCKABLE MaybeSpinLock<true> {
   }
 
  private:
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
   base::NoDestructor<SpinningFutex> lock_;
 #else
   // base::Lock is slower on the fast path than SpinLock, hence we still use it

base/allocator/partition_allocator/spinning_futex_linux.cc

@@ -7,7 +7,7 @@
 #include "base/allocator/partition_allocator/partition_alloc_check.h"
 #include "build/build_config.h"
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
 
 #include <errno.h>
 #include <linux/futex.h>
@@ -70,4 +70,4 @@ void SpinningFutex::LockSlow() {
 }  // namespace internal
 }  // namespace base
 
-#endif  // defined(OS_LINUX) || defined(OS_ANDROID)
+#endif  // defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)

base/allocator/partition_allocator/spinning_futex_linux.h

@@ -12,7 +12,7 @@
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
 
-#if !(defined(OS_LINUX) || defined(OS_ANDROID))
+#if !(defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID))
 #error "Not supported"
 #endif
 

base/allocator/partition_allocator/thread_cache_unittest.cc

@@ -27,7 +27,8 @@
 // on Windows 7 (at least). As long as it doesn't use something else on Windows,
 // disable the cache (and tests)
 #if !BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC) && \
-    !defined(MEMORY_TOOL_REPLACES_ALLOCATOR) && defined(OS_LINUX)
+    !defined(MEMORY_TOOL_REPLACES_ALLOCATOR) &&  \
+    (defined(OS_LINUX) || defined(OS_CHROMEOS))
 
 namespace base {
 namespace internal {
@@ -402,4 +403,5 @@ TEST_F(ThreadCacheTest, PurgeAll) NO_THREAD_SAFETY_ANALYSIS {
 }  // namespace base
 
 #endif  // !BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC) &&
-        // !defined(MEMORY_TOOL_REPLACES_ALLOCATOR) && defined(OS_LINUX)
+        // !defined(MEMORY_TOOL_REPLACES_ALLOCATOR) &&
+        // (defined(OS_LINUX) || defined(OS_CHROMEOS))

base/debug/stack_trace.h

@@ -152,7 +152,7 @@ BASE_EXPORT size_t CollectStackTrace(void** trace, size_t count);
 // scanning area at the origin of the stack, wasting time and not finding any
 // frames (since Android libraries don't have frame pointers). Scanning is not
 // enabled on other posix platforms due to legacy reasons.
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS)
 constexpr bool kEnableScanningByDefault = true;
 #else
 constexpr bool kEnableScanningByDefault = false;