Do not call into blink before initialization

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 7410529528e013eff009c7f83611d44a8d6743d1..60c2430b320562f85ee4cc9866dada7b9e5a101c 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1419,8 +1419,12 @@ void RenderThreadImpl::OnMemoryPressure(
       base::MemoryPressureListener::MEMORY_PRESSURE_CRITICAL) {
     // Trigger full v8 garbage collection on critical memory notification.
     v8::V8::LowMemoryNotification();

[boliu, 2014/05/16 16:31:15]

Could skip v8 and skia as well if blink is not initialized, but apparently they
can handle these calls without blink init, so kept this fix small.

-    // Clear the image cache.
-    blink::WebImageCache::clear();
+
+    if (webkit_platform_support_) {
+      // Clear the image cache. Do not call into blink if it is not initialized.
+      blink::WebImageCache::clear();
+    }
+
     // Purge Skia font cache, by setting it to 0 and then again to the previous
     // limit.
     size_t font_cache_limit = SkGraphics::SetFontCacheLimit(0);