android: Use fdebug-info-for-profiling in minimal_symbols mode (the default).

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index d6392d1df7b2618bd3a7ba5a86129f039aa9babb..ac12aed24a6e4720e1b4733d03274b5029c9046d 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -1724,14 +1724,6 @@ config("symbols") {
         # dump_syms, so this is still required (https://crbug.com/622406).
         cflags += [ "-fno-standalone-debug" ]
       }
-    } else if (is_android) {
-      # Breakpad can't handle DWARF 4 symbols properly yet, so use DWARF 3
-      # explicitly on android where we are hitting https://crbug.com/638485.
-      # The arguments MUST be in this order because of a gcc arg parsing bug.
-      cflags = [
-        "-gdwarf-3",
-        "-g2",
-      ]
     } else {
       cflags = [ "-g2" ]
     }
@@ -1765,16 +1757,16 @@ config("minimal_symbols") {
     cflags = []
     ldflags = [ "/DEBUG" ]
   } else {
+    cflags = [ "-g1" ]
     if (is_android) {
-      # Breakpad can't handle DWARF 4 symbols properly yet, so use DWARF 3
-      # explicitly on android where we are hitting https://crbug.com/638485.
-      # The arguments MUST be in this order because of a gcc arg parsing bug.
-      cflags = [
-        "-gdwarf-3",
-        "-g1",
-      ]
-    } else {
-      cflags = [ "-g1" ]
+      # Android defaults to symbol_level=1 builds in production builds
+      # (https://crbug.com/648948), but clang, unlike gcc, doesn't emit
+      # DW_AT_linkage_name in -g1 builds. -fdebug-info-for-profiling enables
+      # that (and a bunch of other things we don't need), so that we get
+      # qualified names in stacks.
+      # TODO(thakis): Consider making clang emit DW_AT_linkage_name in -g1 mode;
+      #               failing that consider doing this on non-Android too.
+      cflags += [ "-fdebug-info-for-profiling" ]
     }
 
     # Note: -gsplit-dwarf implicitly turns on -g2 with clang, so don't pass it.