SkRecord: increase min block to 512B, remove max.

src/core/SkVarAlloc.cpp

Index: src/core/SkVarAlloc.cpp
diff --git a/src/core/SkVarAlloc.cpp b/src/core/SkVarAlloc.cpp
index 8f84b95743e5ba54d80b39ec34c0c7c2b4f1c502..ba5d6f50b05a12e83aec99bed1a7ff636c299948 100644
--- a/src/core/SkVarAlloc.cpp
+++ b/src/core/SkVarAlloc.cpp
@@ -7,11 +7,6 @@
     #include <malloc.h>
 #endif
 
-enum {
-    kMinLgSize =  4,  // The smallest block we'd ever want to allocate is 16B,
-    kMaxLgSize = 16,  // and we see no benefit allocating blocks larger than 64K.
-};
-
 struct SkVarAlloc::Block {
     Block* prev;
     char* data() { return (char*)(this + 1); }
@@ -24,10 +19,10 @@ struct SkVarAlloc::Block {
     }
 };
 
-SkVarAlloc::SkVarAlloc()
+SkVarAlloc::SkVarAlloc(size_t minLgSize)
     : fByte(NULL)
     , fRemaining(0)
-    , fLgSize(kMinLgSize)
+    , fLgSize(minLgSize)
     , fBlock(NULL) {}
 
 SkVarAlloc::~SkVarAlloc() {
@@ -42,7 +37,7 @@ SkVarAlloc::~SkVarAlloc() {
 void SkVarAlloc::makeSpace(size_t bytes, unsigned flags) {
     SkASSERT(SkIsAlignPtr(bytes));
 
-    size_t alloc = 1<<fLgSize;
+    size_t alloc = 1<<fLgSize++;
     while (alloc < bytes + sizeof(Block)) {
         alloc *= 2;
     }
@@ -50,10 +45,6 @@ void SkVarAlloc::makeSpace(size_t bytes, unsigned flags) {
     fByte = fBlock->data();
     fRemaining = alloc - sizeof(Block);
 
-    if (fLgSize < kMaxLgSize) {
-        fLgSize++;
-    }
-
 #if defined(SK_BUILD_FOR_MAC)
     SkASSERT(alloc == malloc_good_size(alloc));
 #elif defined(SK_BUILD_FOR_UNIX)