Do not initiate Oilpan GC if under known stack pressure.

third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp

Index: third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp
diff --git a/third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp b/third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp
index 8e459762a3b7ab125a3cf164076134b7a4166cde..c11218b3d8fa7b3a40e8475a002e14209c8064f3 100644
--- a/third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp
+++ b/third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp
@@ -58,6 +58,21 @@ void StackFrameDepth::enableStackLimit()
     dummy[sizeof(dummy) - 1] = 0;
 }
 
+bool StackFrameDepth::hasInsufficientStackForGC()
+{
+    size_t stackSize = getUnderestimatedStackSize();
+    if (!stackSize)
+        return false;
+
+    Address stackBase = reinterpret_cast<Address>(getStackStart());
+    RELEASE_ASSERT(stackBase > reinterpret_cast<Address>(stackSize));
+    uintptr_t stackLimit = reinterpret_cast<uintptr_t>(stackBase - stackSize);
+
+    // If less than 8k of stack space is left, better not run a GC.
+    char dummy[2];
+    return (currentStackFrameBaseOnCallee(dummy) - stackLimit) < 8 * 1024;
+}
+
 size_t StackFrameDepth::getUnderestimatedStackSize()
 {
     // FIXME: ASAN bot uses a fake stack as a thread stack frame,