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 5d600b0dba1802959c7f03dec810e7d8fcb0cddb..ff7ad6b2ddc276b8b2890722a2564d76ed420d11 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -107,6 +107,9 @@
         # Android build system, value 1).
         'android_build_type%': 0,
 
+        # Sets whether Android uses ARM FFT.  Default is no.
+        'use_arm_fft%': 0,
+
         # Sets whether chrome is built for google tv device.
         'google_tv%': 0,
 
@@ -177,6 +180,8 @@
       'enable_web_intents%': 0,  # TODO(thakis): Remove, http://crbug.com/173194
       'buildtype%': '<(buildtype)',
 
+      'use_arm_fft%': '<(use_arm_fft)',
+      
       # We used to provide a variable for changing how libraries were built.
       # This variable remains until we can clean up all the users.
       # This needs to be one nested variables dict in so that dependent
@@ -605,7 +610,6 @@
         }, {
           'enable_settings_app%': 0,
         }],
-
         ['OS=="linux" and target_arch=="arm" and chromeos==0', {
           # Set some defaults for arm/linux chrome builds
           'armv7%': 1,
@@ -755,6 +759,9 @@
     # Use system nspr instead of the bundled one.
     'use_system_nspr%': 0,
 
+    # Use ARM FFT if requested 
+    'use_arm_fft%': '<(use_arm_fft)',
+
     # Use system protobuf instead of bundled one.
     'use_system_protobuf%': 0,
 
@@ -1157,6 +1164,7 @@
         # Always uses openssl.
         'use_openssl%': 1,
 
+        'use_arm_fft%': '<(use_arm_fft)',

[Paweł Hajdan Jr., 2013/02/27 17:56:58]

Why so many deep repetitions?

Isn't it sufficient to just put the 0 here?

         'proprietary_codecs%': '<(proprietary_codecs)',
         'enable_task_manager%': 0,
         'safe_browsing%': 2,