GTTF: Make debug symbol "resolution" work even after binaries are moved.

base/debug/stack_trace_win.cc

Index: base/debug/stack_trace_win.cc
diff --git a/base/debug/stack_trace_win.cc b/base/debug/stack_trace_win.cc
index da75b0b61778e7685c90cad554a965c0010c136f..955c03dd8675d918b912252a9197b80c3d46f1d5 100644
--- a/base/debug/stack_trace_win.cc
+++ b/base/debug/stack_trace_win.cc
@@ -12,7 +12,9 @@
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
+#include "base/path_service.h"
 #include "base/process_util.h"
+#include "base/string_util.h"
 #include "base/synchronization/lock.h"
 
 namespace base {
@@ -129,9 +131,7 @@ class SymbolContext {
     SymSetOptions(SYMOPT_DEFERRED_LOADS |
                   SYMOPT_UNDNAME |
                   SYMOPT_LOAD_LINES);
-    if (SymInitialize(GetCurrentProcess(), NULL, TRUE)) {
-      init_error_ = ERROR_SUCCESS;
-    } else {
+    if (!SymInitialize(GetCurrentProcess(), NULL, TRUE)) {
       init_error_ = GetLastError();
       // TODO(awong): Handle error: SymInitialize can fail with
       // ERROR_INVALID_PARAMETER.
@@ -139,6 +139,37 @@ class SymbolContext {
       // process (prevents future tests from running or kills the browser
       // process).
       DLOG(ERROR) << "SymInitialize failed: " << init_error_;
+      return;
+    }
+
+    init_error_ = ERROR_SUCCESS;
+
+    // When transferring the binaries e.g. between bots, path put
+    // into the executable will get off. To still retrieve symbols correctly,
+    // add the directory of the executable to symbol search path.
+    // All following errors are non-fatal.
+    wchar_t symbols_path[1024];
+
+    // Note: The below function takes buffer size as number of characters,
+    // not number of bytes!
+    if (!SymGetSearchPathW(GetCurrentProcess(),
+                           symbols_path,
+                           arraysize(symbols_path))) {
+      DLOG(WARNING) << "SymGetSearchPath failed: ";
+      return;
+    }
+
+    FilePath module_path;
+    if (!PathService::Get(FILE_EXE, &module_path)) {
+      DLOG(WARNING) << "PathService::Get(FILE_EXE) failed.";
+      return;
+    }
+
+    std::wstring new_path(std::wstring(symbols_path) +
+                          L";" + module_path.DirName().value());
+    if (!SymSetSearchPathW(GetCurrentProcess(), new_path.c_str())) {
+      DLOG(WARNING) << "SymSetSearchPath failed.";
+      return;
     }
   }