[Mac] Redo NSException handling, and generate better stacks for C++ exceptions.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 3852d0a866f309e4dbfce3036376b5eff48045e2..39bc2c6302501901c45f5ba231799063e993afec 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -269,6 +269,9 @@ component("base") {
     "mac/bind_objc_block.h",
     "mac/bundle_locations.h",
     "mac/bundle_locations.mm",
+    "mac/call_with_eh_frame.cc",
+    "mac/call_with_eh_frame.h",
+    "mac/call_with_eh_frame_asm.S",
     "mac/cocoa_protocols.h",
     "mac/dispatch_source_mach.cc",
     "mac/dispatch_source_mach.h",
@@ -833,6 +836,8 @@ component("base") {
       "files/file_util_mac.mm",
       "mac/bundle_locations.h",
       "mac/bundle_locations.mm",
+      "mac/call_with_eh_frame.cc",
+      "mac/call_with_eh_frame.h",
       "mac/foundation_util.h",
       "mac/foundation_util.mm",
       "mac/mac_logging.cc",
@@ -1203,6 +1208,7 @@ test("base_unittests") {
     "lazy_instance_unittest.cc",
     "logging_unittest.cc",
     "mac/bind_objc_block_unittest.mm",
+    "mac/call_with_eh_frame_unittest.mm",
     "mac/dispatch_source_mach_unittest.cc",
     "mac/foundation_util_unittest.mm",
     "mac/libdispatch_task_runner_unittest.cc",