Expose ReleaseFreeMemory to free up memory on memory pressure or idle cleanup.

Source/wtf/PartitionAllocTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1476 matching lines @@
         MockPartitionStatsDumper mockStatsDumperGeneric;
         partitionDumpStatsGeneric(genericAllocator.root(), "mock_generic_allocator", &mockStatsDumperGeneric);
         EXPECT_FALSE(mockStatsDumperGeneric.IsMemoryAllocationRecorded());
 
         const WTF::PartitionBucketMemoryStats* stats = mockStatsDumperGeneric.GetBucketStats(2048);
         EXPECT_TRUE(stats);
         EXPECT_TRUE(stats->isValid);
         EXPECT_EQ(WTF::kSystemPageSize, stats->freeableBytes);
         EXPECT_EQ(WTF::kSystemPageSize, stats->residentBytes);
     }
-    partitionPurgeMemory(genericAllocator.root());
+    partitionPurgeMemoryGeneric(genericAllocator.root());
     {
         MockPartitionStatsDumper mockStatsDumperGeneric;
         partitionDumpStatsGeneric(genericAllocator.root(), "mock_generic_allocator", &mockStatsDumperGeneric);
         EXPECT_FALSE(mockStatsDumperGeneric.IsMemoryAllocationRecorded());
 
         const WTF::PartitionBucketMemoryStats* stats = mockStatsDumperGeneric.GetBucketStats(2048);
         EXPECT_TRUE(stats);
         EXPECT_TRUE(stats->isValid);
         EXPECT_EQ(0u, stats->freeableBytes);
         EXPECT_EQ(0u, stats->residentBytes);
     }
     // Calling purge again here is a good way of testing we didn't mess up the
     // state of the free cache ring.
-    partitionPurgeMemory(genericAllocator.root());
+    partitionPurgeMemoryGeneric(genericAllocator.root());
     TestShutdown();
 }
 
 // Tests that the countLeadingZeros() functions work to our satisfaction.
 // It doesn't seem worth the overhead of a whole new file for these tests, so
 // we'll put them here since partitionAllocGeneric will depend heavily on these
 // functions working correctly.
 TEST(PartitionAllocTest, CLZWorks)
 {
     EXPECT_EQ(32u, WTF::countLeadingZeros32(0u));
@@ skipping 11 matching lines @@
     EXPECT_EQ(32u, WTF::countLeadingZerosSizet(0u));
     EXPECT_EQ(31u, WTF::countLeadingZerosSizet(1u));
     EXPECT_EQ(1u, WTF::countLeadingZerosSizet(1u << 30));
     EXPECT_EQ(0u, WTF::countLeadingZerosSizet(1u << 31));
 #endif
 }
 
 } // namespace
 
 #endif // !defined(MEMORY_TOOL_REPLACES_ALLOCATOR)