Align base::Pickle allocations to 4k boundaries

base/bits_unittest.cc

Index: base/bits_unittest.cc
diff --git a/base/bits_unittest.cc b/base/bits_unittest.cc
index e913d6ae598f393f4d2b8ff1b3abaa173b4d3a64..1dad0f453199dac37a2c45da57765f72a2a15f82 100644
--- a/base/bits_unittest.cc
+++ b/base/bits_unittest.cc
@@ -5,6 +5,9 @@
 // This file contains the unit tests for the bit utilities.
 
 #include "base/bits.h"
+
+#include <limits>
+
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
@@ -44,5 +47,17 @@ TEST(BitsTest, Log2Ceiling) {
   EXPECT_EQ(32, Log2Ceiling(0xffffffffU));
 }
 
+TEST(BitsTest, Align) {

[Lei Zhang, 2015/07/24 18:59:55]

Thanks!

+  const size_t kSizeTMax = std::numeric_limits<size_t>::max();
+  EXPECT_EQ(0ul, Align(0, 4));
+  EXPECT_EQ(4ul, Align(1, 4));
+  EXPECT_EQ(4096ul, Align(1, 4096));
+  EXPECT_EQ(4096ul, Align(4096, 4096));
+  EXPECT_EQ(4096ul, Align(4095, 4096));
+  EXPECT_EQ(8192ul, Align(4097, 4096));
+  EXPECT_EQ(kSizeTMax - 31, Align(kSizeTMax - 62, 32));
+  EXPECT_EQ(kSizeTMax / 2 + 1, Align(1, kSizeTMax / 2 + 1));
+}
+
 }  // namespace bits
 }  // namespace base