Do not generate a microdump if there are no webview pointers on the stack.

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index 3c91dc748dbc69bab0fe1a56e7ea1f998f0b004f..3870d58e6afac371ba2a3c19e3b28e0fc225c7e2 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -46,6 +46,9 @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/events/gesture_detection/gesture_configuration.h"
 
+extern char __executable_start;

[Torne, 2016/12/05 15:19:31]

Stick a comment on these explaining that they're defined by the linker and only
their addresses are meaningful.

[Robert Sesek, 2016/12/05 16:19:18]

Are these CXA mangled or should they be extern C?

[Tobias Sargeant, 2016/12/06 16:48:33]

Done.

[Tobias Sargeant, 2016/12/06 16:48:33]

They should be extern "C". (Done.)

+extern char __etext;
+
 namespace android_webview {
 
 namespace {
@@ -209,6 +212,8 @@ int AwMainDelegate::RunProcess(
     // crash handler on the same thread as the crash handler was initialized.
     crash_reporter::AddGpuFingerprintToMicrodumpCrashHandler(
         content_client_.gpu_fingerprint());
+    crash_reporter::SetWebViewTextAddrRange((uintptr_t)&__executable_start,
+                                            (uintptr_t)&__etext);
 
     g_allow_wait_in_ui_thread.Get().reset(
         new ScopedAllowWaitForLegacyWebViewApi);