Fix the speeling of "purgeable" in Gr code

src/gpu/GrGpuResource.cpp

Index: src/gpu/GrGpuResource.cpp
diff --git a/src/gpu/GrGpuResource.cpp b/src/gpu/GrGpuResource.cpp
index 15d5888cc07384d74f2c7db5a1ff078a6030be2a..6d250e4820cec9eb244190e11af32cc25ac74d61 100644
--- a/src/gpu/GrGpuResource.cpp
+++ b/src/gpu/GrGpuResource.cpp
@@ -104,13 +104,13 @@ bool GrGpuResource::setContentKey(const GrContentKey& key) {
     return true;
 }
 
-void GrGpuResource::notifyIsPurgable() const {
+void GrGpuResource::notifyIsPurgeable() const {
     if (this->wasDestroyed()) {
         // We've already been removed from the cache. Goodbye cruel world!
         SkDELETE(this);
     } else {
         GrGpuResource* mutableThis = const_cast<GrGpuResource*>(this);
-        get_resource_cache2(fGpu)->resourceAccess().notifyPurgable(mutableThis);
+        get_resource_cache2(fGpu)->resourceAccess().notifyPurgeable(mutableThis);
     }
 }