Compile specific parts of the Android build with -O2.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 6edbfbecacf75bcd5a52841bcf8f3d172d8b8856..ef4e7fda81f802a6534344c31eeb736447dcaa32 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -908,6 +908,10 @@ component("base") {
   }
 
   configs += [ "//build/config/compiler:wexit_time_destructors" ]
+  if (is_android && !is_debug) {
+    configs -= [ "//build/config/compiler:optimize" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 }
 
 # This is the subset of files from base that should not be used with a dynamic
@@ -920,6 +924,11 @@ source_set("base_static") {
     "win/pe_image.cc",
     "win/pe_image.h",
   ]
+
+  if (is_android && !is_debug) {
+    configs -= [ "//build/config/compiler:optimize" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 }
 
 component("i18n") {
@@ -968,6 +977,11 @@ component("i18n") {
     "//base/third_party/dynamic_annotations",
     "//third_party/icu",
   ]
+
+  if (is_android && !is_debug) {
+    configs -= [ "//build/config/compiler:optimize" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 }
 
 source_set("prefs") {
@@ -1013,6 +1027,11 @@ source_set("prefs") {
   defines = [ "BASE_PREFS_IMPLEMENTATION" ]
 
   deps = [ ":base" ]
+
+  if (is_android && !is_debug) {
+    configs -= [ "//build/config/compiler:optimize" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 }
 
 source_set("prefs_test_support") {