mac: Add the flag "-gline-tables-only" to reduce dSYM size.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 7de617cba6d6b09dfc39e1ed423ddc202c750857..2db290d2d95c53f44d4b6a47972e8d63847064c6 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -5130,6 +5130,17 @@
             # specified or not.
             '-fno-strict-aliasing',  # See http://crbug.com/32204.
           ],
+          'conditions': [
+            ['branding=="Chrome" and buildtype=="Official"', {
+              'OTHER_CFLAGS': [

[erikchen, 2015/04/23 01:20:36]

I don't understand GYP. I figured that this would override the previous
declaration of OTHER_CFLAGS, but it appears to do the right thing.

[Nico, 2015/04/23 01:26:24]

gyp merges lists by appending them. This is documented at
https://code.google.com/p/gyp/wiki/InputFormatReference#Merge_Basics_(=,_?,_+)

[erikchen, 2015/04/23 01:57:49]

I see. It was unclear to me that lists got merged by default. 

+                # The Google Chrome Framework dSYM generated by dsymutil has grown
+                # larger than 4GB, which dsymutil can't handle. Reduce the amount
+                # of debug symbols.
+                '-gline-tables-only',  # See http://crbug.com/479841
+              ]
+            }],
+          ],
+
         },
         'target_conditions': [
           ['_type=="executable"', {