reset shader compilations for stats

src/gpu/gl/GrGLGpuProgramCache.cpp

Index: src/gpu/gl/GrGLGpuProgramCache.cpp
diff --git a/src/gpu/gl/GrGLGpuProgramCache.cpp b/src/gpu/gl/GrGLGpuProgramCache.cpp
index d5f2b9d23daa36af1bcd30ccaae987c69f840b02..df8cf60c7b3cf0d04298f61fe9c5e80c1bf1fe69 100644
--- a/src/gpu/gl/GrGLGpuProgramCache.cpp
+++ b/src/gpu/gl/GrGLGpuProgramCache.cpp
@@ -77,13 +77,30 @@ GrGLGpu::ProgramCache::~ProgramCache() {
 #endif
 }
 
-void GrGLGpu::ProgramCache::abandon() {
+void GrGLGpu::ProgramCache::reset() {
     for (int i = 0; i < fCount; ++i) {
         SkASSERT(fEntries[i]->fProgram.get());
         fEntries[i]->fProgram->abandon();
         delete fEntries[i];
+        fEntries[i] = nullptr;
     }
     fCount = 0;
+
+    // zero out hash table
+    for (int i = 0; i < 1 << kHashBits; i++) {
+        fHashTable[i] = nullptr;
+    }
+
+    fCurrLRUStamp = 0;
+#ifdef PROGRAM_CACHE_STATS
+    fTotalRequests = 0;
+    fCacheMisses = 0;
+    fHashMisses = 0;
+#endif
+}
+
+void GrGLGpu::ProgramCache::abandon() {
+    this->reset();
 }
 
 int GrGLGpu::ProgramCache::search(const GrProgramDesc& desc) const {