Include output of "lsb_release -d" in crash reports....

base/linux_util.h

Index: base/linux_util.h
===================================================================
--- base/linux_util.h	(revision 20935)
+++ base/linux_util.h	(working copy)
@@ -7,6 +7,8 @@
 
 #include <stdint.h>
 
+#include <string>
+
 namespace base {
 
 // Makes a copy of |pixels| with the ordering changed from BGRA to RGBA.
@@ -14,6 +16,10 @@
 // it's assumed to be 4 * |width|.
 uint8_t* BGRAToRGBA(const uint8_t* pixels, int width, int height, int stride);
 
+// Get the Linux Distro if we can, or return "Unknown", similar to
+// GetWinVersion() in base/win_util.h.
+std::string GetLinuxDistro();
+
 }  // namespace base
 
 #endif  // BASE_LINUX_UTIL_H__