Use size_t for strlen() return value

src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp

Index: src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp
diff --git a/src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp b/src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp
index 591cae349c0f8925b4697ad5f30f352890d125cc..3b2488dfc6ecba364f185d383c3eec4ff70708a4 100644
--- a/src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp
+++ b/src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp
@@ -277,7 +277,7 @@ GrGLFuncPtr EGLGLContext::onPlatformGetProcAddress(const char* procName) const {
 }
 
 static bool supports_egl_extension(EGLDisplay display, const char* extension) {
-    int extensionLength = strlen(extension);
+    size_t extensionLength = strlen(extension);
     const char* extensionsStr = eglQueryString(display, EGL_EXTENSIONS);
     while (const char* match = strstr(extensionsStr, extension)) {
         // Ensure the string we found is its own extension, not a substring of a larger extension