make allocPixels throw on failure

src/core/SkBitmap.cpp

Index: src/core/SkBitmap.cpp
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index d83199ddc49fd9597ce2d9f6e7927cabf115a127..a9b802c82fdb53ccae90b2026fa28728d36fba85 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -279,7 +279,7 @@ bool SkBitmap::allocPixels(Allocator* allocator, SkColorTable* ctable) {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-bool SkBitmap::allocPixels(const SkImageInfo& requestedInfo, size_t rowBytes) {
+bool SkBitmap::allocPixelsCheck(const SkImageInfo& requestedInfo, size_t rowBytes) {
     if (kIndex_8_SkColorType == requestedInfo.colorType()) {
         return reset_return_false(this);
     }
@@ -308,8 +308,8 @@ bool SkBitmap::allocPixels(const SkImageInfo& requestedInfo, size_t rowBytes) {
     return true;
 }
 
-bool SkBitmap::allocPixels(const SkImageInfo& requestedInfo, SkPixelRefFactory* factory,
-                           SkColorTable* ctable) {
+bool SkBitmap::allocPixelsCheck(const SkImageInfo& requestedInfo, SkPixelRefFactory* factory,
+                                SkColorTable* ctable) {
     if (kIndex_8_SkColorType == requestedInfo.fColorType && NULL == ctable) {
         return reset_return_false(this);
     }