Allow overriding the log path.

Bug: https://issuetracker.google.com/112588493
Test: manual
Change-Id: Ic273d46544479332b8e031f30feadd1840f2d653
diff --git a/adb_utils.cpp b/adb_utils.cpp
index cf5fbc8..d1910f1 100644
--- a/adb_utils.cpp
+++ b/adb_utils.cpp
@@ -320,6 +320,10 @@
 }
 
 std::string GetLogFilePath() {
+    // https://issuetracker.google.com/112588493
+    const char* path = getenv("ANDROID_ADB_LOG_PATH");
+    if (path) return path;
+
 #if defined(_WIN32)
     const char log_name[] = "adb.log";
     WCHAR temp_path[MAX_PATH];