Add support building with OpenMAX DL FFT for WebAudio

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 82530c1145c0b240abab3bf2cf517b875740a994..e4757c73231dca4154723a91a3f3e43d07822d97 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -668,6 +668,9 @@
       'google_api_key%': '',
       'google_default_client_id%': '',
       'google_default_client_secret%': '',
+
+      # Whether Android uses ARM FFT.  Default is no.
+      'use_arm_fft%': 0,
     },
 
     # Copy conditionally-set variables out one scope.
@@ -1021,6 +1024,8 @@
     # rlz codes for searches but do not use the library.
     'enable_rlz%': 0,
 
+    'use_arm_fft%': '<use_arm_fft)',

[Ryan Sleevi, 2013/02/28 00:33:41]

Why isn't this around line 931?

[Raymond Toy (Google), 2013/03/05 19:30:11]

Moved as requested.

+    
     'conditions': [
       ['OS=="win" and "<!(python <(DEPTH)/build/dir_exists.py <(windows_sdk_default_path))"=="True"', {
         'windows_sdk_path%': '<(windows_sdk_default_path)',