android: Turn on fission and symbol_level=2 by default.

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
-import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
 import("//build_overrides/build.gni")
 
 if (current_cpu == "arm" || current_cpu == "arm64") {
   import("//build/config/arm.gni")
 }
 if (current_cpu == "mipsel" || current_cpu == "mips64el" ||
     current_cpu == "mips" || current_cpu == "mips64") {
   import("//build/config/mips.gni")
 }
@@ skipping 98 matching lines @@
 # Apply the default logic for these values if they were not set explicitly.
 if (gold_path == false) {
   if (use_gold) {
     gold_path = rebase_path("//third_party/binutils/Linux_x64/Release/bin",
                             root_build_dir)
   } else {
     gold_path = ""
   }
 }
 
-if (use_debug_fission == "default") {
-  use_debug_fission =
-      is_debug && !is_android && !is_win && use_gold && cc_wrapper == ""
-}
-
 # default_include_dirs ---------------------------------------------------------
 #
 # This is a separate config so that third_party code (which would not use the
 # source root and might have conflicting versions of some headers) can remove
 # this and specify their own include paths.
 config("default_include_dirs") {
   include_dirs = [
     "//",
     root_gen_dir,
   ]
@@ skipping 1574 matching lines @@
     if (is_mac || is_ios) {
       cflags = [ "-gdwarf-2" ]
       if (is_mac && enable_dsyms) {
         # If generating dSYMs, specify -fno-standalone-debug. This was
         # originally specified for https://crbug.com/479841 because dsymutil
         # could not handle a 4GB dSYM file. But dsymutil from Xcodes prior to
         # version 7 also produces debug data that is incompatible with Breakpad
         # 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" ]
     }
     if (use_debug_fission) {
       cflags += [ "-gsplit-dwarf" ]
     }
     asmflags = cflags
     ldflags = []
 
     # TODO(thakis): Figure out if there's a way to make this go for 32-bit,
@@ skipping 13 matching lines @@
   }
 }
 
 # Minimal symbols.
 config("minimal_symbols") {
   if (is_win) {
     # Linker symbols for backtraces only.
     cflags = []
     ldflags = [ "/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",
-        "-g1",
-      ]
-    } else {
-      cflags = [ "-g1" ]
-    }
+    cflags = [ "-g1" ]
 
     # Note: -gsplit-dwarf implicitly turns on -g2 with clang, so don't pass it.
     asmflags = cflags
     ldflags = []
   }
 }
 
 # No symbols.
 config("no_symbols") {
   if (!is_win) {
@@ skipping 17 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }