combine glyph and image bulk alloc, and adjust initial alloc size, to reduce total waste from 50% t…

src/core/SkChunkAlloc.cpp

Index: src/core/SkChunkAlloc.cpp
diff --git a/src/core/SkChunkAlloc.cpp b/src/core/SkChunkAlloc.cpp
index 30cc4e19a7c363f2ba67f47290b5b2fc46cbf9af..8251eae6621151f7cae1de0653b1aab68a1f059f 100644
--- a/src/core/SkChunkAlloc.cpp
+++ b/src/core/SkChunkAlloc.cpp
@@ -52,6 +52,7 @@ SkChunkAlloc::SkChunkAlloc(size_t minSize) {
     fMinSize = minSize;
     fChunkSize = fMinSize;
     fTotalCapacity = 0;
+    fTotalUsed = 0;
     fBlockCount = 0;
 }
 
@@ -64,6 +65,7 @@ void SkChunkAlloc::reset() {
     fBlock = NULL;
     fChunkSize = fMinSize;  // reset to our initial minSize
     fTotalCapacity = 0;
+    fTotalUsed = 0;
     fBlockCount = 0;
 }
 
@@ -90,6 +92,8 @@ SkChunkAlloc::Block* SkChunkAlloc::newBlock(size_t bytes, AllocFailType ftype) {
 }
 
 void* SkChunkAlloc::alloc(size_t bytes, AllocFailType ftype) {
+    fTotalUsed += bytes;
+    
     bytes = SkAlign4(bytes);
 
     Block* block = fBlock;