Refactor OS_LINUX preprocessor directive for LaCrOS effort.

Currently, ChromeOS defines the OS_LINUX directive as well as
OS_CHROMEOS.  We're working to separate these two, so we're
making the fact that OS_LINUX == OS_LINUX || OS_CHROMEOS
explicit.

This is changes for /components/gwp_asan

This CL was uploaded by git cl split.

R=inferno@chromium.org

Bug: 1110266
Change-Id: I1d55608a65e101e9809d5691c1d6ff4dab2152fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370290Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Commit-Queue: Sean McAllister <smcallis@google.com>
Cr-Commit-Position: refs/heads/master@{#803997}

components/gwp_asan/client/sampling_malloc_shims_unittest.cc

@@ -36,7 +36,7 @@ static size_t GetAllocatedSize(void* mem) {
 static size_t GetAllocatedSize(void* mem) {
   return malloc_size(mem);
 }
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_CHROMEOS)
 #include <malloc.h>
 static size_t GetAllocatedSize(void* mem) {
   return malloc_usable_size(mem);

components/gwp_asan/crash_handler/crash_analyzer.cc

@@ -26,7 +26,7 @@
 #include "third_party/crashpad/crashpad/snapshot/process_snapshot.h"
 #include "third_party/crashpad/crashpad/util/process/process_memory.h"
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
 #include <signal.h>
 #elif defined(OS_APPLE)
 #include <mach/exception_types.h>
@@ -81,7 +81,7 @@ bool CrashAnalyzer::GetExceptionInfo(
 
 crashpad::VMAddress CrashAnalyzer::GetAccessAddress(
     const crashpad::ExceptionSnapshot& exception) {
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
   if (exception.Exception() == SIGSEGV || exception.Exception() == SIGBUS)
     return exception.ExceptionAddress();
 #elif defined(OS_APPLE)

components/gwp_asan/crash_handler/crash_handler_unittest.cc

@@ -34,7 +34,7 @@
 #include "third_party/crashpad/crashpad/snapshot/minidump/process_snapshot_minidump.h"
 #include "third_party/crashpad/crashpad/tools/tool_support.h"
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
 #include "third_party/crashpad/crashpad/snapshot/sanitized/sanitization_information.h"
 #endif
 
@@ -122,7 +122,7 @@ MULTIPROCESS_TEST_MAIN(CrashingProcess) {
   std::map<std::string, std::string> annotations;
   std::vector<std::string> arguments;
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
   static crashpad::SanitizationInformation sanitization_info = {};
   static crashpad::SanitizationAllowedMemoryRanges allowed_memory_ranges;
   if (cmd_line->HasSwitch("sanitize")) {
@@ -150,7 +150,7 @@ MULTIPROCESS_TEST_MAIN(CrashingProcess) {
 #endif
 
   crashpad::CrashpadClient* client = new crashpad::CrashpadClient();
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS)
   bool handler =
       client->StartHandlerAtCrash(/* handler */ cmd_line->GetProgram(),
                                   /* database */ directory,
@@ -458,7 +458,7 @@ TEST_P(CrashHandlerTest, MAYBE_DISABLED(UnrelatedException)) {
 INSTANTIATE_TEST_SUITE_P(VaryAllocator,
                          CrashHandlerTest,
                          testing::Values(
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
                              TestParams("malloc", true),
 #endif
                              TestParams("malloc", false),