Merge experimental/a64 to bleeding_edge.

build/android.gypi

Index: build/android.gypi
diff --git a/build/android.gypi b/build/android.gypi
index 0ea899d6edd9d1896e3e0e17632ae0712cf97395..2f32be0e81f01908e1ab11c95d3353d0e44bfedf 100644
--- a/build/android.gypi
+++ b/build/android.gypi
@@ -184,6 +184,11 @@
                   '-L<(android_stlport_libs)/x86',
                 ],
               }],
+              ['target_arch=="a64"', {
+                'ldflags': [
+                  '-L<(android_stlport_libs)/arm64',
+                ],
+              }],
             ],
           }],
           ['target_arch=="ia32"', {
@@ -208,10 +213,19 @@
         ],
         'target_conditions': [
           ['_type=="executable"', {
+            'conditions': [
+              ['target_arch=="a64"', {
+                'ldflags': [
+                  '-Wl,-dynamic-linker,/system/bin/linker64',
+                ],
+              }, {
+                'ldflags': [
+                  '-Wl,-dynamic-linker,/system/bin/linker',
+                ],
+              }]
+            ],
             'ldflags': [
               '-Bdynamic',
-              '-Wl,-dynamic-linker,/system/bin/linker',
-              '-Wl,--gc-sections',
               '-Wl,-z,nocopyreloc',
               # crtbegin_dynamic.o should be the last item in ldflags.
               '<(android_lib)/crtbegin_dynamic.o',