Enable -fPIE, and -pie in tsan build. We're already -fPIC.

R=mtklein@google.com

Review URL: https://codereview.chromium.org/26142003

git-svn-id: http://skia.googlecode.com/svn/trunk@11701 2bbb7eff-a529-9590-31e7-b0007b416f81

gyp/common_conditions.gypi

@@ -289,6 +289,12 @@
             'conditions' : [
               [ 'skia_sanitizer == "thread"', {
                 'defines': [ 'DYNAMIC_ANNOTATIONS_ENABLED=1' ],
+                'target_conditions': [
+                  [ '_type == "executable"', {
+                    'cflags': [ '-fPIE' ],
+                    'ldflags': [ '-pie' ],
+                  }],
+                ],
               }],
             ],
           }],