Implement basic support for Windows module emission.

components/tracing/common/process_metrics_memory_dump_provider_unittest.cc

Index: components/tracing/common/process_metrics_memory_dump_provider_unittest.cc
diff --git a/components/tracing/common/process_metrics_memory_dump_provider_unittest.cc b/components/tracing/common/process_metrics_memory_dump_provider_unittest.cc
index d05c3a736217d93e93bf179b66b25db8389f6261..490815509e1a292e1cba5a52f4aadcc1812236a4 100644
--- a/components/tracing/common/process_metrics_memory_dump_provider_unittest.cc
+++ b/components/tracing/common/process_metrics_memory_dump_provider_unittest.cc
@@ -22,6 +22,10 @@
 #include <mach-o/dyld.h>
 #endif
 
+#if defined(OS_WIN)
+#include <base/strings/sys_string_conversions.h>
+#endif
+
 namespace tracing {
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
@@ -274,6 +278,31 @@ TEST(ProcessMetricsMemoryDumpProviderTest, TestPollFastMemoryTotal) {
 #endif
 }
 
+TEST(ProcessMetricsMemoryDumpProviderTest, TestWinModuleReading) {
+  using VMRegion = base::trace_event::ProcessMemoryMaps::VMRegion;
+
+  ProcessMetricsMemoryDumpProvider mdp(base::kNullProcessId);
+  base::trace_event::MemoryDumpArgs args;
+  base::trace_event::ProcessMemoryDump dump(nullptr, args);
+  ASSERT_TRUE(mdp.DumpProcessMemoryMaps(args, &dump));
+  ASSERT_TRUE(dump.has_process_mmaps());
+
+  TCHAR module_name[MAX_PATH];

[Wez, 2017/02/23 04:15:11]

wchar_t

[erikchen, 2017/02/23 21:00:14]

Done.

+  DWORD result = GetModuleFileName(nullptr, module_name, MAX_PATH);
+  ASSERT_TRUE(result);
+  std::string executable_name = base::SysWideToNativeMB(module_name);
+
+  bool found_components_unittests = false;

[Wez, 2017/02/23 04:15:11]

For extra credit:

Use GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
some_function_address) to get the handle to the module containing this test code
(may or may not be the test exe) then grab a dump and check that it has a region
containing the address, with the right module name. ;)

[erikchen, 2017/02/23 21:00:14]

Done.

+  for (const VMRegion& region : dump.process_mmaps()->vm_regions()) {
+    EXPECT_NE(0u, region.start_address);
+    EXPECT_NE(0u, region.size_in_bytes);
+
+    if (region.mapped_file.find(executable_name) != std::string::npos)
+      found_components_unittests = true;
+  }
+  EXPECT_TRUE(found_components_unittests);
+}
+
 #if defined(OS_MACOSX)
 TEST(ProcessMetricsMemoryDumpProviderTest, TestMachOReading) {
   using VMRegion = base::trace_event::ProcessMemoryMaps::VMRegion;