Change Pickle to double its capacity by default, rather than increasing...

base/pickle_unittest.cc

Index: base/pickle_unittest.cc
===================================================================
--- base/pickle_unittest.cc	(revision 11625)
+++ base/pickle_unittest.cc	(working copy)
@@ -167,7 +167,8 @@
       static_cast<int>(payload_size_after_header - sizeof(uint32)));
   size_t cur_payload = payload_size_after_header;
 
-  EXPECT_EQ(pickle.capacity(), unit);
+  // note: we assume 'unit' is a power of 2
+  EXPECT_EQ(unit, pickle.capacity());
   EXPECT_EQ(pickle.payload_size(), payload_size_after_header);
 
   // fill out a full page (noting data header)
@@ -176,10 +177,10 @@
   EXPECT_EQ(unit * 2, pickle.capacity());
   EXPECT_EQ(cur_payload, pickle.payload_size());
 
-  // one more byte should expand the capacity by one unit
+  // one more byte should double the capacity
   pickle.WriteData(data_ptr, 1);
   cur_payload += 5;
-  EXPECT_EQ(unit * 3, pickle.capacity());
+  EXPECT_EQ(unit * 4, pickle.capacity());
   EXPECT_EQ(cur_payload, pickle.payload_size());
 }