Enabled debug mode for "shared_library".

To mitigate runtime errors, DCHECK needs to be disabled until relevant bugs are fixed.

chromiumcontent/args/shared_library.gn

@@ -1,7 +1,7 @@
 root_extra_deps = [ "//chromiumcontent:chromiumcontent" ]
 is_electron_build = true
 is_component_build = true
-is_debug = false
+is_debug = true
 symbol_level = 2
 enable_nacl = false
 enable_widevine = true

patches/dcheck.patch

@@ -0,0 +1,13 @@
+diff --git a/base/logging.h b/base/logging.h
+index c67b937e5b08..e61a35859450 100644
+--- a/base/logging.h
++++ b/base/logging.h
+@@ -718,7 +718,7 @@ DEFINE_CHECK_OP_IMPL(GT, > )
+ #if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
+ #define DCHECK_IS_ON() 0
+ #else
+-#define DCHECK_IS_ON() 1
++#define DCHECK_IS_ON() 0
+ #endif
+ 
+ // Definitions for DLOG et al.

patches/v8/dcheck.patch

@@ -0,0 +1,13 @@
+diff --git a/src/base/logging.h b/src/base/logging.h
+index e852dde8dd..a57ddf5404 100644
+--- a/src/base/logging.h
++++ b/src/base/logging.h
+@@ -214,7 +214,7 @@ DEFINE_CHECK_OP_IMPL(GT, > )
+ // The DCHECK macro is equivalent to CHECK except that it only
+ // generates code in debug builds.
+ #ifdef DEBUG
+-#define DCHECK(condition)      CHECK(condition)
++#define DCHECK(condition)      CHECK((condition) || true)
+ #define DCHECK_EQ(v1, v2)      CHECK_EQ(v1, v2)
+ #define DCHECK_NE(v1, v2)      CHECK_NE(v1, v2)
+ #define DCHECK_GT(v1, v2)      CHECK_GT(v1, v2)